Apera Instruments pH/EC Calibration Solution Kit (pH 7.00, 4.01, 1413 µS, 12.88 mS) plus 3M KCl Storage Solution, 250 ml each & CalBox

The specified pH values are accurate to +/- 0.01 pH at 25 °C and can be returned to NIST standard reference materials (SRMs) Colour coded for quick identification The Apera CalBox is included to organise all solutions and facilitate the calibration process Brand: Apera Instruments