Maximize your fleet's uptime and efficiency with the ATD Tools ATD-3325 3-in-1 DEF/Coolant/Battery Refractometer. This indispensable tool streamlines routine maintenance, saving valuable time and labor costs. Unlike cumbersome multi-tool setups, the ATD-3325 combines three critical tests -DEF concentration, coolant freeze point, and battery electrolyte specific gravity -into a single, easy-to-use device. The precision-engineered optics and automatic temperature compensation ensure consistently accurate readings, minimizing guesswork and potential misdiagnoses that lead to costly repairs or vehicle downtime. Its compact design and inclusion of a protective carrying case make it ideal for use in any setting. The ATD-3325 operates solely on ambient light, eliminating the need for batteries or power sources, ensuring convenience and reliability in the field. This translates to reduced maintenance time, faster turnaround for repairs, and fewer unexpected breakdowns. Prevent costly repairs and maximize your fleet's operational efficiency -choose the ATD-3325. Invest in preventative maintenance and see the return in reduced operational expenses and improved fleet uptime. Its ergonomic design minimizes user fatigue, while the clear, easy-to-read scale ensures quick and accurate results, even in challenging lighting conditions. The comprehensive kit includes a fluid dropper, cleaning cloth, screwdriver, and a blow-molded storage case for complete convenience and protection.