FEATURES: BNC Socket, 300cm long cable, comes with protective cap with storage bottle; Comes with pH 4.00, pH 6.86 and pH 9.18 calibration powder.; Replaceable electrode 0~14pH pH measuring range; Made of a pH electrode and a silver chloride (Ag/AgCl) reference electrode for pH value measurement; Wide application but not limited to chemical engineering, pharmaceuticals, laboratory experiments, aquaculture, and hydroponics.