These waterproof pH and ORP testers offer anodized aircraft aluminum with protective coating and fully encapsulated electronics for durability. The LCD provides measurement reading with temperature available in both a live and hold measurement mode. Calibration features three point automatic buffer recognition for pH 4, 7, and 10 buffers. What's included: Tester holster, lanyard, and 1.5V n alkaline battery. Waterproof, pocket-sized meters for water analysis testing up to 3 point calibration with 4, 7 and 10 buffer automatic temperature compensation PTBT2 0575445 with Bluetooth for data transfer.