HM Digital PH-200 Waterproof pH/Temperature MeterFEATURES Measures pH and temperature Auto ranging three point calibration with digital fine tuning Includes 4 pH buffer solution in a sponge embedded in a clear cap, so you can see if it's dried up Waterproof housing Simultaneous temperature display Measurement Range: 0 14 pH Digital Calibration (push button) Auto off function, data hold function and low battery indicator Display: large and easy to read LCD screen includes simultaneous temperature