... pH Meter pH Standard Solutions NIST, pH4.00/6.86/9.18 or USA, pH4.01/7.00/10.01 LIDA220 pH MeterPORTABLE pH ... function, and it willdisplay the tip of standard buffer solution, you need onlyimmerse the electrode in standard ... to replace itor not. Automatic Temperature CompensationLIDA220 with temperature sensor, which can measuretemperature of solution and can compensate temperatureautomatically ...