Thermco’s Plastic Hydrometers are fabricated from polycarbonate (PC) which makes the instrument shatter-proof, while offering glass-like clarity for ease of reading. All models are plain form, so a separate thermometer should be used to measure the temperature of the sample and correct for any temperature variations. Temperature standard is 60º FLength 300 mm. The plastic hydrometers are made for... Specific Gravity, Salt-Brine , Baume, Sugar Brix scales.