The pH600-BOX is a pH tester can be used in many different applications and is considered an excellent starter unit for digital pH measurement. The calibration procedure is very simple and fast. This tester has 1 point manual calibration, ±0.1 pH accuracy and a range of 0.0 to 14.0 pH. The pH600-BOX is supplied in a snap over “oyster shell” plastic packaging complete with calibration screwdriver, 20 ml of 7.01 calibration solution, batteries and instructions.