and TDS with one meter and one probe

Insert new filter into bottle

Over 300 hours of battery life (batteries included)

Low power demand for extended battery life (batteries included)

Unscrew the wing nut

Milwaukee Instruments 4x20ml, pH 4 + 4 + 7 + 7 Buffer Solution, for Digital pH Meter Calibration 997965763388 and TDS with one meter1x pH 4 + 1x pH 4 + 1x pH 7 + 1x pH 7 Buffer solution, 20ml each for Any Brand pH Electrode sensor probe tester meter Calibration and Storage Milwaukee M10004 pH 4. 01 Calibration Solution Sachets M10004 is a lab grade pH 4. 01 buffer solution certified to meet the standard to an accuracy of 0. 01 pH removing the inaccuracies involved with mixing calibration solutions from powder. Sachet packaging means that you get fresh solution every time. Ideal