The microprocessor-based pH 5+ meter 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. Automatic Temperature Compensation (ATC) automatically identifies the correct pH buffer for rapid calibration. Calibrate up to 3 points; selectable buffers USA - pH 4.01, 7.00, 10.01; NIST - pH 4.01, 6.86, 9.18. Operates on Four (4) 1.5 V batteries with an estimated 200 hours continuous use. Achieve professional results at an economical price. The microprocessor-based pH 6+ meter gives you high accuracy and reliability. Use this meter to take pH, mV and temperature measurements. The millivolt readout lets you take ORP readings. Meter includes a protective rubber boot that also acts as a meter stand.