แนะนำเพื่อน

RF41 / Extech Portable Battery Coolant/Glycol Refractometer with ATC (°C) Refractometer measures the Propylene/Ethylene Glycol freezing point from -50 to 0°C and the Specific Gravity of battery acid from 1.11 to 1.30 and provides a quick reference of battery charge condition.