The Complete Guide To Extech Rf40: Specifications, Pros And Cons, Troubleshooting, And Buying Tips
Extech RF40 Information The Extech RF40 is a portable battery coolant/glycol refractometer that is easy to operate and provides accurate and repeatable measurements on easy-to-read scales. It measures the freeze point of automotive coolants (propylene glycol and ethylene glycol) from 32°F to -60°F, and also indicates the specific gravity of battery acid and provides a quick reference of battery charge condition. Image: