- Easy to Read: Our car coolant tester features clear ratios and indicators, allowing for intuitive reading of test results. This user-friendly design ensures that anyone, regardless of experience, can easily verify the accuracy and reliability of measurements. - Easy to Use: Designed for 6 and 12 volt systems, this frost protection tester effectively checks both heat and cold batteries. It can be calibrated in both Celsius and Fahrenheit, with a measuring range of -43 °C to -13 °C, enabling quick and straightforward assessment of coolant conditions. - Durable Construction: Made from high-quality ABS plastic and silicone, this frost protection refractometer offers excellent wear resistance and high-temperature durability. It helps prevent engine overheating and water freezing, making it ideal for cold weather use. - Versatile Applications: This coolant refractometer provides accurate assessments of frost protection levels across all cooling water temperatures. Whether you own a car, SUV, or truck, it ensures reliable measurement of your coolant's frost protection capabilities. - Practical Use Scenarios: 1. Perform routine maintenance checks before winter to ensure optimal coolant performance and engine protection. 2. Use it to quickly assess coolant condition during roadside emergencies or before long trips in cold climates. 3. Ideal for automotive professionals needing to guarantee the reliability of coolant systems across various vehicle types.