Simple to operate and sufficient for many field and lab pH tests. Basic pH Meter (840087) Large ⅞" high digits and lightweight design make this pH meter ideal for both field and lab applications. Simple to operate and works with any electrode with a BNC connector. Measures the full 0 ~ 14 pH range with a high 0.01 pH resolution. Features 2-pt. calibration, hold function, fold-out easel back and a tripod screw. Comes with a 9V battery, calibration tool, and full instructions. PROBE NOT INCLUDED. The General Purpose pH Probe (840016) and the Spear Tip pH Probe (840049) (for non-liquid measurements) are sold separately. .