8oz pH Calibration Buffer Solution Kit for pH 4.00 & 7.00 + 4oz 3M KCL Storage Solution pH/ORP Electrode AI1113 1

Been using this for my AC Infinity Pro pen. Accurate, good packaging, adequate size for frequent fresh solution. Good value for ideal calibration.

Well packaged and excellent price.

Excellent value for the money saved me from buying a brand new pH pen it calibrated my pen perfectly I'm very pleased with my purchase

The bottles were labelled incorrectly, otherwise 5 stars. 12.88mS solution was inside the 1413us bottle and 1413 solution was inside the 12.88 bottle. Otherwise products work as described but wasted a little bit while determining the problem. The sealed storage tray is a nice touch. And the bottles were individually vacuum sealed to prevent leakage/cross contamination during shipping.

Good kit, will last a while