What bothers me is its operation will be that it weighs well or badly, when I put a standard weight (KG or grs) it does not do what the other electronic scales do to climb from 1 in one rises from 10gr to 10gr for example I have something of 145 gr and it sends it to 150 gr, and if I add something like for example 135 it rounds it to 140 - The first problem I had was that it was not zero, it was always changing, I changed a 1.0uf capacitor and bye problem - replace the voltage regulators + and - with new ones. (just in case) - adjust the internal calibration preset to zero. I measured the cell in ohms and millivolts scale (2mv 350 ohms cell) (red, green, black and white wire) TECHNICAL SPECIFICATIONS: KRETZ 5580 30KG Du = dp = $ 0.01 e = dd = dt = 10 g Max = 30 g Min = 0.2 kg Tare = -15 kg Limit = 30 kg 220v 50HZ Argentina origin class III I appreciate your help