Extremely popular pocket pH tester. The Hanna Instruments Checker is a real favourite with its clear LCD display, long thin pH electrode and ease of operation. Simple to use, small enough to pop in a pocket and exceptionally well-priced.The electrode is quick and easy to replace by unscrewing it from the meter body and adding a new one. Simple to perform one or two point automatic calibration, the buffer solutions are automatically recognised. The tester is supplied with probe, calibration solutions, and cleaning solutions packaged in a durable plastic carrying case.