PCE-SG is a handheld refractometer used to determine the specific gravity (sg) of electrolyte solution batteries as well as the freezing point of propylene or ethylene glycol-based coolants in degrees Celsius (°C). This refractometer works well for measuring cleaning products too. The instrument also gives indication of the charge level in battery acid.

- Measuring ranges: Ethylene glycol: -50 ... 0 °C
- Resolution: Ethylene glycol: 5 °C
- Accuracy: Ethylene glycol: ± 5 °C