I just got an omp grain scale and i cant get it calibrated. It says use a 200gr weight. Well i push the calibration button and set the weight on it and it blinks for awhile then it says "fail". What am i doing wrong?
I have an OMP grain scale. All I do is turn it on and if it does not read "0" I punch the calibration button and it goes to "0". If I want to weigh arrows I put the arrow holder on, hit cal., it then goes to "0" and I can weigh my arrows
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