High-quality Refractometer offers a fast, easy way to test the freezing point of coolant/anti-freeze. Works with Ethylene or Propylene Glycol or long-life anti-freeze. Also measures battery acid gravity to determine battery life. Automatic temperature compensation. Large, easy-to-read graphics and high-contrast lens. Adjustable viewfinder; rugged, steel body construction. Includes storage case, fluid dropper, cleaning cloth and mini screwdriver.