The OEG hand-held refractometer measures whether water-propylene glycol and water ethylene glycol mixtures in solar systems, heating systems and other systems are frost-proof. Additionally, you can also measure the operating status of battery liquids. It only has a small volume, low weight and is easy to handle. That is why it can be applied almost anywhere. It is frequently used with maintenance work at solar thermal systems, because the quality of the solar liquid can be determined with this measuring device quickly and easily.Measuring ranges:>
• Propylene glycol: 0°C to -50°C
• Ethylene glycol: 0°C to -50°C
• Battery acid: 1.10 - 1.30 g/cm³