Check the listing for details. Milwaukee PH-MAIN Maintenance Kit for pH / ORP Meters and Testers. Condition: New. Listed at 32.99 USD. DESCRIPTIONPH-MAIN kit is set of storage and cleaning solutions designed to extend the life of your pH or ORP electrode. Keeping your sensor clean during calibration and measurement ensures accurate and repeatable readings. The pH sensor needs to be hydrated for the ion exchange process to occur. In general, and depending on the frequency of use and the type of application, soak your pH or ORP electrode once per week in MA9016 Cleaning Solution for about 15 minutes. After soaking, remove the electrode, rinse with Distilled Water and put the MA9015 Storage Solution in the probe cap before storage. This will keep your pH or ORP sensor hydrated and ready for the next use. If the probe sensor should become dry, storage solution can be used for reconditioning. Included in the kit is pH storage solution (MA9015) and pH cleaning solution (MA9016). All bottles are 230 mL.The storage and cleaning solutions are lab grade produced with premium chemicals.Milwaukee solutions are designed to help you achieve reliable and repeatable pH measurements while extending the life of your electrode.DESIGN FEATURESFundamental for the correct use of electrodes and for obtaining the most accurate and reproducible readingsSealed against light with air tight, tamper proof capMarked with lot numbers and expiry datesIncludedMA9015 Electrode cleaning solution (230 mL)MA9016 Electrode storage solution (230 mL)SPECIFICATIONSpH Calibration Accuracy: Standard ±0.01 pHpH Values: @25°C 4.01 and 7.01Package: BottlesSize 230 mLQuantity: 2Certificate of Analysis: No