Audio Additives Stylus Force Gauge inconstantcy


I recently purchased an Audio Additives Stylus Force Gauge and it is driving me nuts. I get inconstant readings every time I lower the stylus onto the little black dot on the plate. Without moving the arm, every time I lower, raise, lower, etc., I get a different reading between 1.68 - 1.88. The batteries are new, device reads 0.000g at start up, calibration checks out using supplied weight, room temperature is 72F, no interference from tonearm lifter and everything is level.
Anyone else have this problem?
128x128seasoned
I used the Ortofon and it was so unreliable I threw it in the trash !
The Shure is fine to 1.5 , over that a PITA .
By the way...

@melm- If you owned an AV Designhaus Derenville VPM 2010-1(about $650K) with(say) an Air-Tight Opus 1 or Koetsu Coralstone Platinum($14-15K ea) mounted, you wouldn’t be asking that. Some of, "we"(though: not me) have that kind of scratch, for lab-quality instrumentation(God bless ’em).

This Dereneville VPM 2010-1 is not for sale - it’s never for sale!It’s just a prototype for testing.No one can buy it.

Cheers Rainer
from AVDesignHaus
Aside from the magnetic interference lewm mentions the problem might not be the gauge. A tonearm with bad vertical bearings will do exactly the same thing. Get one of these, https://soundapproach.com/rek-o-kut-roksfg-1-stylus-force-gauge.html?gclid=CjwKCAjwqIiFBhAHEiwANg9sz...

Take repeat readings measuring the distance of the weight side to the platter. If if varies at all you have a problem with your tonearm. There is no way a scale like this can be off unless the weights are bad.
You could also buy another digital gauge and if the readings are consistent the gauge you have now is defective. But, as has been mention the cheap digital scales are a risk. Like Lewm I also use an Ortofon Gauge. I check it once in a while with a calibration weight. I always get consistent readings. The Platform is stainless steel which is not magnetic. 
I forgot to mention, if I were going to buy another gauge I would get the Rega Atlas Gauge. I like the way it locates the stylus in a little cup and it is obviously a much more serious piece than the Chinese gauges looking at the internals.