Labtron LPHM-A11 Pen-Type pH Meter measures pH across a range of -1.00 to 15.00 pH with ±0.05 pH accuracy and 0.01 pH resolution. Its digital display provides clear readings, while the compact design supports portable sample testing. Automatic 1 to 3-point calibration reduces manual adjustment, while the IP57 waterproof rating supports use in wet environments. Replaceable electrodes, automatic power-off, and a low-voltage alarm support routine measurement operations.