Tri Electronics GXL-18L Professional Gold Platinum Tester (6K - 18K) Uses safe liquid refills, good for up to 1000 tests Tests 6k to 18k Size: 12 x 10 x 3 (305 x 254 x 76mm) Weight: 3 lb (1.35 kg) Power: two 9-Volt batteries (included) Comes with durable hard case with secure compartments for all accessories