Review on Blue Upgrade LED Water Quality Test Meter - Pancellent TDS PH EC Temperature 4 in 1 Kit by Erica Houlf

I read some negative reviews and thought some people didn't follow the instructions well, I'll try. I have followed the instructions for the tee and I am unable to calibrate this PH meter. I've been waiting to get my hydroponic garden installed and now it's too late to bring it back. It's calibrated to 6.86 but when I went to step 2 to calibrate to 4.01 it showed 6.86 again. I waited a while for it to drop to around 4 (from 3.98 to 4.04 but it never really showed 4.01) and thought that was it, so I waited for it to stop blinking and washed it in distilled water. When I tested it, solution 6.86 showed 9.8! And when I tried to calibrate again it just said 0.00. This is a very confusing gauge! Unfortunately I can't recommend it.