5V button cell batteries (included)   (LR44 or equivalent)

5% Full Scale | +/-0

Alarm: Beeps for 20 seconds

Long-lasting – Lasts up to 2x longer than most pitcher filters

Milwaukee MA9020 ORP Calibration Solution 200-275 mV | 230 mL for Platinum & Gold Electrodes Groline calibration 5V button cell batteries (included)Milwaukee MA9020 ORP Calibration Solution 200 275 mV 230 mL The Milwaukee MA9020 is a lab grade ORP validation solution certified to the 200275 mV range. Designed for use with platinum and gold ORP electrodes, it ensures your meter delivers accurate, repeatable oxidation reduction potential readings every time. Whether you're managing water quality in aquaculture, hydroponics, laboratories, or industrial applications, the MA9020 gives you the