Unscrew the wing nut

and TDS with one meter and one probe

Temperature Range: 0-60°C (32-140°F)

Easy-grip carrying handle

Industrial 1/2" NPT threaded sensor for permanent installation

Milwaukee Instruments 4x20ml, pH 4 + 4 + 7 + 7 Buffer Solution, for Digital pH Meter Calibration 997965763388 Unscrew the wing nut1x 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