Accurate Hydroponic Growing: General Hydroponics 4 01 Calibration Solution Review

I haven't used the product yet, but I've started scribbling the expiration date with a marker, or at least I think so? What worries me is that they even decided to trick the customer or make him wonder if it's them or not. Shady if you ask me. Now I have to deal with the expiration date before I even break the seal. I will update the review after a few uses and weeks after opening. But for now 2 stars!

Noticing that all the plants were showing serious signs of stress, I ordered a new pH meter that came with the same pH calibration solutions. After calibrating the new pen in the new solution, I tested the old GH 7.01 and got a score of 7.6. The soil pH measurement showed values consistent with water that was too acidic for the root system due to the inaccuracy of the GH calibration solution. After three months with a new pen and new calibration solution every month, the plants come back with…

A great calibration solution so far. Arrived on time, colors help a lot and seem very accurate as advertised. The best advice I can give to others is that you NEVER want to EVER dip your equipment directly into these calibration bottles as you will instantly contaminate the solutions and waste your money (no matter how hard you try to avoid). ). Instead, ALWAYS pour a small amount of each solution into separate containers (shot glasses work well, heh) and submerge the devices in these separate…