Extech Rf40 Vs. Competitors: In-depth Comparison Of Specs, Performance, And Price
Extech RF40 Information The Extech RF40 is a portable battery coolant/glycol refractometer that measures the freezing point of automotive coolants (propylene glycol and ethylene glycol) from 32°F to -60°F. It also indicates the specific gravity of battery acid and provides a quick reference of battery charge condition. The RF40 features automatic temperature compensation (ATC), so you can get accurate readings even if the temperature of the coolant or battery acid is not at 77°F. Image: Specifications: