TDS Meter Calibration

Did you try calibrating first with 4.0 and then with 7.0?
With my calibration pen i faced this issue! Good luck bro!

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Truth be told I did the thing I normally do. Don’t read instructions and just think I can figure out this expensive gadget with my own intelligence. That was a mistake.

I finally broke down and YT’d it and read the instructions, and proceeded to follow the prescribed instructions. I wonder if I have contaminated the calibration solutions which are package in very small amounts.