Monitor the freezing point of both Ethylene Glycol and Propylene Glycol in your battery with this coolant checker. REED R9700 Offers This battery coolant/glycol refractometer features Automatic Temperature Compensation (ATC) and monitors the freezing point of both Ethylene Glycol and Propylene Glycol. In addition the R9700 indicates battery recharge level. Features Measures the freezing point of automotive coolants plus battery charge condition Provides accurate and repeatable measurements of % Ethylene Glycol and Propylene Glycol and C° on easy to read scale Automatic Temperature Compensation (ATC) Requires only 2 or 3 drops of sample Included Refractometer Cover plate Calibration screwdriver Cleaning cloth Solution/Sample applicator Hard carrying case