Features: Measures freezing point for winter protecting of automotive. The antifreeze- coolant tester measures quickly and accurately, and the scale and pointer are easy to read. The tester i-s accurately calibrated and has easy-to-read indicator, which i-s convenient and practical. The antifreeze- coolant tester i-s designed- and made of durable materials, which i-s durable and a high-quality product. It can avoid the freezing of water in cold weather of the engine to cause mechanical failure and engine failure. Specifications: Material: plastomer Length: approx 26.5cm/10-inch Usage method: Remove the filler hole cover on the battery, Then put the lower end of the densimeter into the battery, Hold the rubber ball- on the upper part of the densitometer and slowly relax the rubber ball- Suck the electrolyte- into the glass- tube to float the internal color disc The reading can be read by the floating position. Note: When reading, the observation line should be parallel- to the liquid level Note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Coolant Tester