The WD-35613-53 microprocessor-based pH 5+ meter with NIST-Traceable calibration is OAKTON’s most economical portable pH meter, yet it gives you the same high accuracy and reliability of our other portable meters! Use this meter to take routine pH and temperature measurements. Meter includes a protective rubber boot that also acts as a meter stand. The WD3561353 includes the meter, a pH electrode and a temperature probe.