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Optical Measurement
Refractive Index Standards
Paragon Scientific produces a range of refractive index standards for use in the calibration and verification of all types of refractometer e.g. handheld, Abbe and high accuracy digital instruments.

Colour Standards
These range of liquid colour standards includes AOCS-Tintometer, ASTM, Gardner, Lovibond RYBN, Pt-Co and Saybolt Colour, the key colour scales applied to oils, fuels & chemicals.

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- High Temperature Viscosity Standards - 100 to 150 °C
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- Certified Ethanol Standards - % ABV (Alcohol by Volume)
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- BS/IP/MSL Viscometer for Transparent Liquids
- BS/U-tube Viscometer for Transparent Liquids
- BS/U/M Miniature Viscometer for Transparent Liquids
- Cannon-Fenske Routine Viscometer for Transparent Liquids
- Cannon-Fenske Opaque Viscometer for Transparent and Opaque Liquids
- Houillon ISL® Viscometer for Transparent and Opaque Liquids
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- Zeitfuchs Cross-Arm Viscometer for Transparent and Opaque Liquids
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- D86 Distillation
- D1160 Distillation
- D1319 Hydrocarbon:(FIA)
- D1401 Water Seperability
- D2500 Cloud Point
- D3242 Acidity In Fuel
- D524 Ramsbottom
- D525 Oxidation Stability
- D611 Aniline Point
- D6371 Cold Filter Plugging Point
- D892 Foaming Of Lube Oils
- D943 Oxidation
- D97 Pour Point
- Glass Capillary Viscometers
- BS/IP/RF U-Tube Reverse Flow for Transparent and Opaque Liquids
- BS/IP/SL Viscometer for Transparent Liquids
- BS/IP/SL(S) Suspended Level Short Form for Transparent Liquids
- BS/IP/MSL Viscometer for Transparent Liquids
- BS/U-tube Viscometer for Transparent Liquids
- BS/U/M Miniature Viscometer for Transparent Liquids
- Cannon-Fenske Routine Viscometer for Transparent Liquids
- Cannon-Fenske Opaque Viscometer for Transparent and Opaque Liquids
- Houillon ISL® Viscometer for Transparent and Opaque Liquids
- Ubbelohde Viscometer for Tranparent Liquids
- Zeitfuchs Cross-Arm Viscometer for Transparent and Opaque Liquids
- Viscometers & Viscometer Bath Media
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