Milwaukee Instruments, M1000AB, Resh-Start Starter Solution Sachet Kit for pH Meters and TestersM1000AB Includes Only:pH 7.01 Calibration Buffer Solution, 20ml (10 pcs)Rinse Solution - Deionized Water, 20ml (5 pcs)pH 4.01 Calibration Buffer Solution, 20ml (5 pcs)pH 10.01 Calibration Buffer Solution, 20ml (5 pcs)FRESH-START is set of pH calibration and electrode rinse solutions designed to optimize the accuracy of your measurements and avoid cross contamination between samples or calibration solutions. Included in the kit is lab grade pH 4.01 buffer solution (M10004B) sachets, pH 7.01 buffer solution (M10007B) sachets, pH 10.01 buffer solution (M10010B) sachets and electrode rinse solution (M10000B) sachets. All sachets are 20 mL.The buffer solutions are certified to meet the standard to an accuracy of ±0.01 pH removing the inaccuracies involved with mixing buffers.Electrode rinse solution is ideal for using as an intermediate rinse between samples or calibration solutions to avoid cross contamination. This rinse solution is also ideal for removing basic salt deposit buildup on the probe or cap caused by storage solution evaporation. Even though salt deposit buildup is normal, it should be removed before measurement or calibration.Features:Solutions - 20 mL pH buffers are for the correct use of electrodes and for obtaining the most accurate and reproducible readingsElectrode rinse solution is fundamental for gently rinsing the electrode between like samples or calibration solutions as well as rinsing off salt deposit buildup.Sealed against light and airIdeal for on-the-spot calibrationSimply open, insert the tester or electrode into the sachet and gently stir Unit of MeasureSet of 25 pcs.