The Draper Expert Refractometer Kit is a precision diagnostic tool designed for measuring antifreeze concentration, battery electrolyte specific gravity and screenwash strength. This versatile refractometer is ideal for automotive workshops, mobile mechanics and fleet maintenance professionals who need accurate fluid testing across multiple vehicle systems. Built to work with modern antifreeze formulations including G11, G12 and G13 coolants, this refractometer features automatic temperature compensation (ATC) technology that ensures consistent, reliable readings regardless of ambient conditions. The comprehensive measuring ranges cover antifreeze protection from 0 to -50°C, battery fluid specific gravity from 1.10 to 1.40, and screenwash effectiveness from 0 to -40°C, making it suitable for year-round vehicle maintenance and pre-winter preparation checks. The complete kit arrives in a protective storage case and includes all necessary accessories: a calibration screwdriver for maintai