The Senz pH tester is specially designed for industrial applications. Its ruggedness surpasses other cheap pH meters. It is splash proof and floats on water. It's portability makes it the most convenient and reliable tester for technicians to perform onsite water checking and testing. Ruggedness Its ruggedness is unmatched by any similar pocket size tester. The uniquely reinforced glass sensor can withstand accidental drops and shocks. One-Touch Calibration On activation, the tester performs a single point calibration at pH buffers 7, 4 or 10. Never missed a calibration point with the endpoint sensing feature. Auto-End Point Eliminates guesswork! The tester automatically senses a stable end-point reading and freezes it for recording. Beep Function The tester beeps at every press of a button and beeps on every completed function and end-point reading.