Check the listing for details. Milwaukee PH-COMBO Starter Solution Kit for pH and ORP Meters. Condition: New. Listed at 69.99 USD. DESCRIPTIONPH-COMBO is set of storage, cleaning and calibration solutions designed to extend the life of your pH electrode. Included in the kit is lab grade pH 4.01 buffer solution (MA9004), pH 7.01 buffer solution (MA9007), pH storage solution (MA9015), pH cleaning solution (MA9016) and pH and ORP 3.5M KCl electrolyte solution (MA9011). All bottles are 230 mL. The buffer solutions certified to meet the standard to an accuracy of ±0.01 pH removing the inaccuracies involved with mixing buffers. 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. 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. 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 datesIncluded MA9004 pH 4.01 Calibration Buffer Solution (230 mL)MA9007 pH 7.01 Calibration Buffer Solution (230 mL)MA9011 pH and ORP 3.5M KCl electrolyte solution (230 ml)MA9015 Electrode cleaning solution (230 mL)MA9016 Electrode storage solution (230 mL)