Review on 🌱 Optimized Hydroponic Calibration Solution for Gardening by Girish Underwood

The product is great and works as it should. My only problem is user error, not company error. I forgot to order the test tube kit. Luckily I have test bottles for my aquariums, although their dimensions are slightly different from those shown in the test kit photos. If anyone knows offhand what size the test tubes are I would be very grateful for the information, for the accuracy. I would have just ordered a kit but it took weeks to ship (no fault of the post office, we just live in times like this. Thanks for a great product that is far more reliable than my constantly calibrated digital ph meter! Namaste