I've calibrate my machine with an electronic weight measurement. What I've seen is that my machine, an eagnas smart 6000, are not very secure. http://www.eagnas.com/smart600.html My question, is it normal for an electronic machine that when I take 25 kg that the tension is from 24,4 till 25,5 kg for example. Just every pull is a littlebit different. The weight-measurement is +/- 0,2 kg secure. The digital display shows 1 decimal, but the fault in tension is almost 1 kg. I've also tested the difference in tension by a handle-machine and this is very exact. Is a hand-machine exacter as an electrical one?