One pocket sized meter for pH, TDS and temperature! Up to 5 point pH calibration with NIST or USA auto buffer recognition. Pin-style conductivity sensors feature stainless steel electrodes for chemical resistance and durability. Replaceable sensor module saves you money by reusing the meter body. Advanced features include auto-shutoff, user-adjustable temperature coefficient, self-adjusting TDS and low-battery indicator. Up to 5 point pH calibration with NIST or USA auto buffer recognition.