DURABLE DESIGN: Constructed from high impact ABS plastic, this hydrometer tester is drop-proof and crush-resistant for reliable readings. VERSATILE TESTING: Compatible with 6V, 12V and 24V lead-acid batteries commonly found in cars, motorcycles, RVs and more. ACCURATE RESULTS: Quickly tests battery condition via floating hydrometer that precisely measures specific gravity across multiple cells. PORTABLE : Small and light in weight, and convenient for you to carry.