SPECTROSCOPY - 53 ads

China 232000 B2B Services
High purity PFA tube semiconductor cleaning equipment accessories

Friday, April 19, 2024

Supports custom processing of various styles of PFA accessories.Suitable for semiconductor photovoltaic equipment, fluid equipment, as well as instruments such as chromatography, spectroscopy, mass spectrometry, etc #semiconductor #ICPMS #PFAValue #teflon Mobile: +86-153 6614 0844...

Nanjing Binzhenghong Instrument Co.,Ltd

  • 232000 - nanjing
  • +15 8 05 19 47 70
  • +86 153 6614 0844
China 310030 Feasts items
Magnets Used in Medical Industry

Monday, April 08, 2024

Magnets have numerous applications in the medical industry, where they are used for diagnostics, treatments, imaging, and various medical devices. Here are some common uses of magnets in the medical field: Magnetic Resonance Imaging (MRI): MRI machines utilize powerful magnets to...

Hangzhou Tengye Magnetic Materials Co., Ltd.

  • 310030 - Hangzhou
  • +57 1 86 78 19 12
Ceramic Packaged Infrared Detector

Tuesday, February 06, 2024

Quantity : 5-2000 uni - Price : $269-$2000

Ceramic Packaged Infrared Detector Similar to metal packaging, ceramic packaging is also a mature ir detector packaging technology. And it benefits from the improvement of readout circuit performance and the increasingly perfect Tecless technology. Without TEC, it can reduce the requirements...

IRay Technology Co., Ltd.

China 232000 Medical
PFA Acid Purification System High Efficiency Digital Display for Preparation of High Pu...

Wednesday, January 31, 2024

Our acid purifier can be used for the purification of HNO3, HCl, HF, alkali solution and organic solvents in the laboratory. Acid purifier is the use of thermal radiation principle, keep the liquid temperature below the boiling point temperature evaporation, and then the acid vapor...

Nanjing Binzhenghong Instrument Co.,Ltd

  • 232000 - nanjing
  • +15 8 05 19 47 70
  • +86 153 6614 0844
China 116001 B2B Services
High Temperature Paraffin Wax

Saturday, January 20, 2024

Quantity : no limited - Price : USD900-USD2000/MT

What Is Melting Point of Wax? High melting point paraffin wax is ideal for various industrial fields, such as paper, PVC, adhesives, coating, ect. King Honor's wax with high melting point has the melting point of hard paraffin from 64℃ to 72℃ with white color, low oil content, and...

King Honor International

  • 116001 - Dalian
  • 0411 81822086
Notch Filter

Thursday, January 18, 2024

Quantity : 10 pcs-500 - Price : $40-$200

The notch filter, in contrast to a narrow band filter, intercepts light in a particular wavelength range by transmitting light at most wavelengths. Notch filters are useful in applications where it is necessary to filter out the laser light. For example, in drug bioassays, in order...

Hyperion Optics

  • CMLopez
  • 210007 - nanjing
  • +86 25 86626311
China 030006 Vehicles
SWIR CAMERAS

Thursday, January 18, 2024

Specialist in SWIR imager Indium Gallium Arsenide (InGaAs) imaging technology, GHOPTO IR camera manufacturer supplies a wide range of high-quality infrared camera for sale covering the spectrum from 900nm-1700nm or 400nm-1700nm at a good SWIR camera price. As one of the leading swir...

Shanxi Guohui Optoelectronics Technology Co., Ltd.

  • 030006 - Taiyuan
  • 86 0351 7195681
Achromatic Cemented Lens

Tuesday, January 16, 2024

Quantity : 20000pcs p - Price : $0.5-200.00

Achromatic Cemented Lens Achromatic Cemented Lens is used to minimize or eliminate chromatic aberration. The achromatic design also helps minimize spherical aberrations. Achromatic Cemented Lenses are ideal for a range of applications, including fluorescence microscopy, image relay...

BRD Optical

  • 130000 - Changchun
  • +86 (431) 8188 4163
Achromatic Cemented Cylindrical Lens

Tuesday, January 16, 2024

Quantity : 20000pcs p - Price : $0.5-200.00

Achromatic Cemented Cylindrical Lens An achromatic cylindrical lens can minimize chromatic aberration, so it can be used to focus a single direction of a multi-color light beam. Unlike a spherical lens that produces a point-focusing spot, an achromatic cylindrical lens can produce...

BRD Optical

  • 130000 - Changchun
  • +86 (431) 8188 4163
China 210007 Second hand goods
Achromatic Triplet Lenses

Wednesday, November 08, 2023

An achromatic triplet lens is a compound lens consisting of three single lenses. The triplet design is the simplest to give the required number of degrees of freedom to allow the lens designer to overcome all Seidel aberrations. Calcium Fluoride and UV Fused Silica Elements Broadband...

Hyperion Optics

  • CMLopez
  • 210007 - nanjing
  • +86 25 86626311
China 130000 B2B Services
Optical Cylindrical Lens

Friday, November 03, 2023

Price : $0.5-200.00

A cylindrical optical lens is typically used to focus, condense or expand incoming light. A cylindrical optical lens has one cylindrical surface, causing light to be focussed in a single dimension or axis. It can also be used to expand the output of a laser diode into a symmetrical beam...

BRD Optical

  • 130000 - Changchun
  • +86 (431) 8188 4163
Corner Cube

Friday, September 29, 2023

Price : 1usd-10000usd

Corner cube is a glass element used for reflection. It reflects the incident light beam at three 90 degree. a. UV Material b. High Flatness c. High Volume d. Cheap Price What Are Some Applications of Corner Cubes? Corner cubes have several applications in different fields and are...

TianCheng Optics CO.,Ltd

  • tcoptik
  • 130000 - Kuan Cheng
  • 86 431 89851801
Dichroic Mirror

Friday, September 29, 2023

Price : 1usd-10000usd

The ir dichroic mirror, augmented by colour filters that perfected their colour-selective action, directed a blue image to the first tube, a green image to the second, and a red image to the surface. Dichroic Mirrors Using Purproses Tian Cheng Optics Co.,Ltd offers a wide choice of...

TianCheng Optics CO.,Ltd

  • tcoptik
  • 130000 - Kuan Cheng
  • 86 431 89851801
Corner Cube Retroreflector

Friday, August 04, 2023

Price : $0.5-200.00

BK7 and UVFS Corner Cube Retroreflector Prism are designed to deviate incident light by 180 degrees independently of an angle of incidence. These corner cube prism have three mirror surfaces with angles at 90° to each other, juxtaposed to form the corner of a cube with the entrance...

BRD Optical

  • 130000 - Changchun
  • +86 (431) 8188 4163
China 102600 Second hand goods
EtCO2 Monitors

Friday, July 07, 2023

The carbon dioxide monitor produced by Kingst adopts non-dispersive infrared spectroscopy technology (NDIR). Etco2 monitor uses are siginificantly wide. The et co2 monitor can measure the concentration or partial pressure of carbon dioxide in the patient's exhaled breath, and then...

Kingst Commercial and Trade Co.,Ltd

  • 102600 - Daxing
  • 68056857
Borosilicate Glass Windows for Sale

Tuesday, July 04, 2023

Quantity : 10-1000000 - Price : 1usd-10000usd

Borosilicate is the alternative for borofloat 33 (BF33). Therefore, this kind of glass is called high borosilicate glass. Our Borosilicate window has high transmittance in the visible and near-infrared regions, making it ideal for a wide range of optical applications. It boasts a...

TianCheng Optics CO.,Ltd

  • tcoptik
  • 130000 - Kuan Cheng
  • 86 431 89851801
BK7 Window

Tuesday, July 04, 2023

Quantity : 10-1000000 - Price : 1usd-10000usd

At TC Optik, we are proud to offer high-quality BK7 window that are manufactured to the highest standards of precision and quality. Our bk7 optical windows are made from high-quality borosilicate optical glass with exceptional optical transmission characteristics, and are ideal for...

TianCheng Optics CO.,Ltd

  • tcoptik
  • 130000 - Kuan Cheng
  • 86 431 89851801
China 210007 B2B Services
Achromatic Triplet Lenses

Tuesday, June 27, 2023

A achromatic triplet lens is a compound lens consisting of three single lenses. The triplet design is the simplest to give the required number of degrees of freedom to allow the lens designer to overcome all Seidel aberrations. Calcium Fluoride and UV Fused Silica Elements Broadband...

Hyperion Optics

  • CMLopez
  • 210007 - nanjing
  • +86 25 86626311
China 264006 Equipment goods
RTD3171MR Metallic Detectors of IR Spectroscopy

Saturday, June 03, 2023

Quantity : 5-2000 uni - Price : $269-$2000 (conventi

RTD3171MR Metallic Packaged Uncooled IR Light Detector employs a self-developed 17μm uncooled VOx thermal imaging sensor capable of 384×288 resolution. It features a combination of high sensitivity and reliability to meet stringent image quality requirements. Resolution: 384×288 Pixel size...

IRay Technology Co., Ltd.

China 102600 Medical
Normal EtCO2 Waveform Capnography Monitor Device

Thursday, May 11, 2023

As a technology-based company, we have been focusing on developing and innovating carbon dioxide modules and monitors for more than 20 years. And we have been promoting etco2 series modules and cooperating with many well-known medical companies since 2008. Our products have obtained...

Kingst Commercial and Trade Co.,Ltd

  • 102600 - Daxing
  • 68056857
Borosilicate Glass Windows for Sale

Thursday, April 27, 2023

Price : 30--45 dollars

Boro Glass for Sale Borosilicate is the alternative for borofloat 33 (BF33). Therefore, this kind of glass is called high borosilicate glass. Our Borosilicate window has high transmittance in the visible and near-infrared regions, making it ideal for a wide range of optical applications...

Henan Fandewei automobile products CO.,LTD

  • Fandewei
  • 461700 - xuchang
  • 0086 374 2088716
Silicon Window

Thursday, April 27, 2023

Price : 30--45 dollars

Silicon has a low 2.329 g/cm3 density which is half the density of Germanium, making it ideal for weight-sensitive applications, such as silicon windows. Silicon's price is much better compared with Germanium. Many military brand companies choose TC Optics Silicon lenses or windows...

Henan Fandewei automobile products CO.,LTD

  • Fandewei
  • 461700 - xuchang
  • 0086 374 2088716
Ge Window

Thursday, April 27, 2023

Price : 30--45 dollars

At TC Optics germanium window suppliers, you can expect superior performance, reliability and longevity - all at an unbeatable price point. Germanium (Ge) is in the range of 2-12 μm. Germanium is the most commonly used for making optical lenses and optical windows in high-efficiency...

Henan Fandewei automobile products CO.,LTD

  • Fandewei
  • 461700 - xuchang
  • 0086 374 2088716
ZnSe Window

Thursday, April 27, 2023

Price : 30--45 dollars

Our ZnSe Window is made with high-quality Zinc Selenide material, making it ideal for use in laser systems. The window ensures high transmittance in the infrared region, allowing for precise and accurate laser processing. Znse focus lens, znse laser lens is well-suited for optical...

Henan Fandewei automobile products CO.,LTD

  • Fandewei
  • 461700 - xuchang
  • 0086 374 2088716
Sapphire Glass Window

Thursday, April 27, 2023

Price : 30--45 dollars

Tcoptics, one of professional big size sapphire windows manufacturers, provides all types of custom sapphire windows, which have a series of excellent physical and chemical characteristics such as high strength, high hardness, high-temperature resistance, abrasion resistance, corrosion...

Henan Fandewei automobile products CO.,LTD

  • Fandewei
  • 461700 - xuchang
  • 0086 374 2088716
Quartz Window

Thursday, April 27, 2023

Price : 30--45 dollars

This non-crystalline, uv fused silica glass combines a very low thermal expansion coefficient with good optical qualities and excellent transmittance in the ultraviolet region. Transmission and homogeneity exceed those of crystalline quartz without the problems of orientation and...

Henan Fandewei automobile products CO.,LTD

  • Fandewei
  • 461700 - xuchang
  • 0086 374 2088716
BK7 Window

Thursday, April 27, 2023

Price : 30--45 dollars

At TC Optik, we are proud to offer high-quality BK7 windows that are manufactured to the highest standards of precision and quality. Our BK7 fused silica windows are made from high-quality borosilicate optical glass with exceptional optical transmission characteristics, and are ideal...

Henan Fandewei automobile products CO.,LTD

  • Fandewei
  • 461700 - xuchang
  • 0086 374 2088716
China 130000 Vehicles
Corner Cube Retroreflector

Thursday, February 16, 2023

BK7 and UVFS Corner Cube Retroreflector Prism are designed to deviate incident light by 180 degrees independently of an angle of incidence. These corner cube prism have three mirror surfaces with angles at 90° to each other, juxtaposed to form the corner of a cube with the entrance...

BRD Optical

  • 130000 - Changchun
  • +86 (431) 8188 4163
China 102600 Equipment goods
EtCO2 Modules

Monday, January 16, 2023

The end-tidal carbon dioxide modules (etco2 modules) independently developed and produced by Kingst can be used with multi-parameter patient monitors, ventilators and anesthesia machines for monitoring of real-time ETCO2 concentration, inhaled CO2 concentration, respiratory rate,...

Kingst Commercial and Trade Co.,Ltd

  • 102600 - Daxing
  • 68056857
China 102600 Equipment goods
Normal EtCO2 Waveform Capnography Monitor Device

Monday, January 16, 2023

As a technology-based company, we have been focusing on developing and innovating carbon dioxide modules and monitors for more than 20 years. And we have been promoting etco2 series modules and cooperating with many well-known medical companies since 2008. Our products have obtained...

Kingst Commercial and Trade Co.,Ltd

  • 102600 - Daxing
  • 68056857
Connecting Integrated Micro-optical System with Fibers

Friday, September 16, 2022

Price : 1-10usd

Custom Fiber Array Units of High precision and tailored PM fiber optical assemblies for your optical transimission & integration needs of any system. Custom Fiber Array and PM Fiber Optical Devices MEISU specializes in precise custom fiber array sub-assemblies and PM fiber optical...

Zhongshan Meisu Technolody Co.,Ltd

Dichroic Mirror

Saturday, September 10, 2022

Price : 1-10usd

The ir dichroic mirror, augmented by colour filters that perfected their colour-selective action, directed a blue image to the first tube, a green image to the second, and a red image to the surface. Dichroic Mirror Specification Material BK7 or Fused Silica Design Wavelength 546...

TianCheng Optics CO.,Ltd

  • tcoptik
  • 130000 - Kuan Cheng
  • 86 431 89851801
China 210000 B2B Services
Environmental Center Heavy Metal Detection Sealed Digestion Tank Stainless Steel High...

Wednesday, July 27, 2022

Quantity : 1000 - Price : 120,00 €

The high-pressure digestion tank is a closed container that can decompose insoluble substances. It is used for sample pretreatment in chemical analysis methods such as gas phase, liquid phase, plasma spectroscopy mass spectrometry, atomic absorption and atomic fluorescence. Working principle...

Nanjing Binglab Company

  • 210000 - Jiangsu
  • +15 8 05 19 47 70
China 523000 B2B Services
SHORT WAVE INFRARED IR CAMERAS

Thursday, June 23, 2022

Specialist in Indium Gallium Arsenide (InGaAs) imaging technology, Zillion Techs manufactured a wide range of high-quality short wave infrared (SWIR) cameras covering the spectrum from 900nm-1700nm or 400nm-1700nm. Our short wave ir cameras include 1D linear arrays and 2D focal plane arrays ...

Dongguan Zillion Technologies Co., Ltd.

  • 523000 - dongguan
  • +86 18589063051
China 130000 B2B Services
Corner Cube Retroreflector

Friday, May 20, 2022

BK7 and UVFS Corner Cube Retroreflector Prism are designed to deviate incident light by 180 degrees independently of an angle of incidence. These corner cube prism have three mirror surfaces with angles at 90° to each other, juxtaposed to form the corner of a cube with the entrance...

BRD Optical

  • 130000 - Changchun
  • +86 (431) 8188 4163
China 528400 Clothes
Custom Fiber Array and PM Fiber Optical Devices

Wednesday, May 18, 2022

MEISU specializes in precise custom fiber array sub-assemblies and PM fiber optical devices and assemblies for different areas like integrated optics, sensoring, healthcare, spectroscopy, etc. With a team have more than 20 years of experience in R&D and production of optical components...

Zhongshan Meisu Technolody Co.,Ltd

China 523000 B2B Services
SHORT WAVE INFRARED IR CAMERAS

Saturday, April 16, 2022

Quantity : 10-1000 pc - Price : USD9,000 - USD 18,00

Specialist in Indium Gallium Arsenide (InGaAs) imaging technology, Zillion Techs manufactured a wide range of high-quality short wave infrared (SWIR) cameras covering the spectrum from 900nm-1700nm or 400nm-1700nm. Our short wave china ir camera include 1D linear arrays and 2D focal...

Dongguan Zillion Technologies Co., Ltd.

  • 523000 - dongguan
  • +86 18589063051
China 118009 Underwears
Dynamic Light Scattering (DLS)

Friday, March 18, 2022

Dynamic light scattering (DLS), also known as photon correlation spectroscopy (PCS), is a commonly used characterization method for nanoparticles. The DLS particle size analyzer has the advantages of accuracy, rapidity, and good repeatability for the measurement of Nano particles...

Dandong Bettersize Instruments Ltd.

  • 118009 - Dandong
  • +15 1 41 55 76 96
Corner Cube Retroreflector

Wednesday, September 29, 2021

Price : 100USD

BRD Optical Co. Ltd. has state-of-the-art, modern technology machines for manufacturing and inspecting all kinds of precision optics. Our company occupies an area of 2,000 square meters, supported by 120 workers. BRD Optical as one of the best precision optical components companies...

BRD Optical

  • 130000 - Changchun
  • +86 (431) 8188 4163
Achromatic Coated Lens

Wednesday, September 29, 2021

Price : 100USD

BRD Optical was founded in 2004, and is located in the city of Changchun-the optic base of China with a beautiful view and profound optical culture. We have state-of-the-art, modern technology machines for manufacturing and inspecting all kinds of precision optics. Our company occupies...

BRD Optical

  • 130000 - Changchun
  • +86 (431) 8188 4163
Achromatic Cemented Cylindrical Lens

Wednesday, September 29, 2021

Price : 100USD

BRD Optical was founded in 2004, and is located in the city of Changchun-the optic base of China with a beautiful view and profound optical culture. We have state-of-the-art, modern technology machines for manufacturing and inspecting all kinds of precision optics. Our company occupies...

BRD Optical

  • 130000 - Changchun
  • +86 (431) 8188 4163
China 118009 Search / buy
Dynamic Light Scattering (DLS)

Thursday, July 15, 2021

Dynamic light scattering (DLS), also known as photon correlation spectroscopy (PCS), is a commonly used characterization method for nanoparticles. The dynamic light scattering machine is used for dynamic light scattering particle size analysis. The dls particle size analyzer with...

Dandong Bettersize Instruments Ltd.

  • 118009 - Dandong
  • +15 1 41 55 76 96
China 310053 B2B Services
FT-2000P Portable FTIR Gas Analyzer

Wednesday, April 14, 2021

Overview Of FT-2000P Portable FTIR Gas Analyzer Based on FTIR technology, FT-2000P portable FTIR gas analyzer can continuously monitor various kinds of components in the emission, such as SO2, NOx (NO, NO2), CH4, NH3, HCl, HF, CO, CO2, O2, H2O. According to actual measuring need,...

HANGZHOU ZETIAN TECHNOLOGY CO., LTD

  • 310053 - Hangzhou
  • +0086 18957111635
EM-5 Flue Gas Analyzer

Tuesday, March 02, 2021

Quantity : 10,000 - Price : 0-50,000

Overview Of EM-5 continuous flue gas analyzer EM-5 series continuous flue online gas analyzer is a series of self-developed gas analysis products for online gas analysis of domestic as well as foreign environmental protection and industrial control. Based on UV Differential Optical...

HANGZHOU ZETIAN TECHNOLOGY CO., LTD

  • 310053 - Hangzhou
  • +0086 18957111635
Continuous Emission Monitoring System

Tuesday, March 02, 2021

Quantity : 10,000 - Price : 0-50,000

Among all the online continuous emission monitoring system suppliers in China, ZETIAN is the only high and new technology company that has a full set of intellectual property rights of flue gas monitoring. Its independent research and development products include ultraviolet glue gas analyzer...

HANGZHOU ZETIAN TECHNOLOGY CO., LTD

  • 310053 - Hangzhou
  • +0086 18957111635
Continuous Emission Monitoring & Process Control

Tuesday, March 02, 2021

Quantity : 10,000 - Price : 0-50,000

The instruments and analyzers produced by one of the best continuous emission monitoring system suppliers, ZETIAN now are widely used at home and abroad. They are: UV DOAS gas analyzer, laser TDLAS gas analyzer, gas analysis module, forward/backward laser dust monitoring devices...

HANGZHOU ZETIAN TECHNOLOGY CO., LTD

  • 310053 - Hangzhou
  • +0086 18957111635
Notch Filter

Friday, January 08, 2021

Price : 10-30USD

Hyperion Optics is a premium full-service photonics supplier. Hyp design capabilities can meet the unique requirements of various customers. The notch filter, in contrast to a narrow band filter, intercepts light in a particular wavelength range by transmitting light at most wavelengths...

Hyperion Optics

  • CMLopez
  • 210007 - nanjing
  • +86 25 86626311
Dynamic Light Scattering (DLS)

Friday, September 11, 2020

Quantity : 1 set

Dynamic light scattering (DLS), also known as photon correlation spectroscopy (PCS), is a commonly used characterization method for nanoparticles. The DLS particle size analyzer has the advantages of accuracy, rapidity, and good repeatability for the measurement of Nano particles...

Dandong Bettersize Instruments Ltd.

  • 118009 - Dandong
  • +15 1 41 55 76 96
China 250033 Raw materials
Trifluoroacetic acid 99.5 % Min liquid/cas 76-05-1 from China !

Sunday, March 15, 2020

Quantity : 200MT/mont - Price : 30 USD/Kilogram

Classification. Organic Acid Refractive index.1.3 Cas NO.: 76-05-1 Flash Point: -3 oC Molecular Formula: C2HF3O2 Purity: 99.5% Melting Point: -15%C Appearance: clear liquid Boiling Point: -15.4 °C usage: industrial and medical use Stbilty: Stable. Incompatible with combustible material...

Basic Steps For SPE Columns Operation

Wednesday, October 09, 2019

Solid phase extraction (SPE) is used to reduce sample matrix interference and improve detection sensitivity. The separation selectivity of the solid phase depends on the retention strength of the components that can be retained, so the selection of the solid phase will depend on the...

Hawach Scientific Co.,Ltd.

  • 710077 - Xi'an
  • +86 29 89284429
  • +15 1 02 91 81 33
Dynamic Light Scattering (DLS)

Tuesday, July 16, 2019

Dynamic light scattering (DLS), also known as photon correlation spectroscopy (PCS), is a commonly used characterization method for nanoparticles. DLS particle size analyzer has the advantages of accuracy, rapidity, and good repeatability With the update of the instrument and the...

Dandong Bettersize Instruments Ltd.

  • 118009 - Dandong
  • +15 1 41 55 76 96
China china Equipment goods
Nd:YVO4

Thursday, April 21, 2016

Quantity : 999

Nd: YVO4 crystal is one of the most efficient laser host crystal currently existing for diode laser pumped solid state lasers. Its large stimulated emission cross-section at lasing wavelength, high absorption coefficient and wide absorption bandwidth at pump wavelength, high laser...

Crysmit Photonics Co.,Ltd

  • china - fujian
  • +15 0 59 15 21 65
China Food
photo not available

Wednesday, May 09, 2007

Aloe Vera Freeze Dried Powder 200:1 conforms to the fresh Aloe Vera Gel in a dilution with water (1:199). The excellent quality is guaranteed by continous tests like the NMR-spectroscopy. Aloe Vera is a wonderful moisturizer, it reduces inflammation and is able to improve the wound...

Vita-Solar Biotechnology

Number of results per page : 6 30 150

Search result SPECTROSCOPY WHOLESALERS DISPLAYS - 1 Result

1. Hangzhou ToupTek Photonics Co., Ltd. - ToupTek is a High-Tech enterprise and professional manufacturer of CCD / CMOS cameras and spectrometers.We have over 10 years of experience in D.M.S Scientific Instruments and have a good reputation in this field. Now, we are specialized in the research, development and manufacture of Digital-Auto Microscopy Systems and Spectroscopy Systems.

Search SPECTROSCOPY


Help on search

  • The search engine doses not care about the case of your text. [ cats dogs ] will search pages talking of cats and dogs in the same page.
  • The double quotes (") allow you to search an exact phrase, respecting all caracters including spaces.
  • The MINUS (-) forbids a word, eg [ dogs -cats ] returns all pages with dogs but no cats inside the text. you can add a MINUS (-) before a sentence with double quotes ("), like -"white cats".