The Draper 99810 Disc Type Anti-Freeze Tester is fitted with an easy to read gauge The Draper 99810 Disc Type Anti-Freeze Tester is suitable for testing Propylene Glycol coolant (anti-freeze) density. The five floating discs enable accurate readings in both Celsius and Fahrenheit as well as testing hot and cold and measuring the condition of the anti-freeze. Features: Easy to read gauge Overall length is 465mm Measuring range from -7 to -46 °C / +20 to -50°F Suitable for testing Propylene Glycol coolant density Manufactured from strong and durable plastic and rubber Specifications: Length: 465mm Range: -7 to -46 °C / +20 to -50°F