Review on Nynelly Calibration Solution Precise Calibration，PH by Jayshawn Cuatlayol

This kit was purchased to calibrate an inexpensive digital pH meter and then to test that meter against two other indoor hydroponic pH measurement methods. (The other two methods were with drops in a vial versus a color chart and pH test strips.) The test strip and vial methods confirmed the reported pH of the solutions made with these sachets. Unfortunately, even after calibration, the digital meter was not in the same range, so a waste of money. dh=UTF8&psc=1(My hydroponic system is designed for water pH in the 5.5-6.0 range, so the lower range doesn't matter to my needs. The strips are right on target with these calibration solutions , as does the tube method ( This includes lower pH ranges.) Leading me to believe these solutions are correct. Product exactly as described, at a better price than other suppliers here at Revain. No complaints from me!