Hello everyone. I have purchased 2 digital ph meters and they just absolutely suck. They are 2 different brands and do the exact same thing but give wrong readings.
I ah e calibrated both the same and just mixed 4 different sets of solutions to try and ensure it’s accurate. I used clean cups. Clean stir stick, I washed the meters between solutions.
Both of them I used separate solution cups for each meter to ensure I did not cross contaminate the solutions. After the 3rd calibration solution the 9.18 mix I turned them off and cleaned them with distilled water. I mixed new solutions. I stick the now supposed calibrated meter in the 6.86 solution and it reads 7.2. The other meter reads 7.5 in its new 6.86 solution. These little calibration packs are expensive too and I’m going through a lot of them. I swear these meters were built for the sole purpose of selling those things expensive ass calibration packets.
Anyone know of a good and reliable meter they can share a link to on amazon? Thanks again guys.