My experience with these repackaged generic gauges like the one you are using is that they are all unreliable - perhaps its some form of magnetic interference (i.e. this is why it measures fine on calibration weights but goes haywire with a cart)
The Riverstone that others cite likely does not suffer from this due to the added mechanism offsetting the location point and getting the cartridge magnet away from the weight mechanism.
These days I use the Rega Gauge which eschews magnetic materials entirely and works a dream but it is rather premium priced
The Riverstone that others cite likely does not suffer from this due to the added mechanism offsetting the location point and getting the cartridge magnet away from the weight mechanism.
These days I use the Rega Gauge which eschews magnetic materials entirely and works a dream but it is rather premium priced