Ethylene Glycol: -50C to 0C (0%70%) Propylene Glycol: -50C to 0C (0%70%) Resolution: 5C, 5% (ATC) Temperature Compensation Range: 10C30C Field of View Intermediate Scale: (ETHYLENE GLYCOL) Ethylene glycol antifreeze freezing point (PROPYLENE GLYCOL) Propylene glycol type antifreeze freezing point Left Scale: (BATTERY FLUID) Battery liquid specific gravity 1.151.20 Needs charging 1.201.25 Adequate power 1.251.30 Fully charged Right Scale: Glass cleaning solution freezing point Principle: This instrument measures the freezing point of antifreeze and glass cleaning agents, as well as the specific gravity of lead-acid battery electrolyte. It includes a temperature compensation device for accurate measurements between 10C and 30C ambient temperature. The device operates on the principle of the critical angle of total reflection to measure the refractive index of the solution, which is then used to determine concentration and performance. Due to its reliable operation and accuracy, compact size, lightweight design, and ease of use, it is widely used in the automotive industry. Usage Tips: - Avoid long-term storage in environments with relative humidity above 85% to protect the optical system. - Prevent liquids or water from entering the adjustment knob or eyepiece to avoid internal damage. - Avoid dropping or impacting the device to maintain measurement accuracy. - After use, clean the prism and refractive plate with a soft, clean cloth. Package Includes: 1 x Refractometer 1 x Pipette 1 x Instruction Manual 1 x Mini Screwdriver 1 x Cleaning Cloth