Grotek pH Buffer #4 500 Millilitres

Grotek pH Buffer #4 500 Millilitres We recommend calibrating pH testers weekly for readings you can trust. It’s best to keep pH electrodes wet, calibrate pH meters at #4 to give your pen a “slope” reference. pH Calibration Solutions are available for all of your pH meters. Each solution is made with superior quality ingredients and is conveniently color-coded for easy reference. Be sure your meters are accurate by calibrating with Grotek Solutions.