As an update, I just bought the Gempro 250 from [url=http://www.oldwillknottscales.com/index.asp?PageAction=VIEWPROD&ProdID=291]Old Will Knott[/url] and in a quick check, it seems to be accurate to +/- .001g. I used the 20.0 gr OIML F2 weight that comes with the unit, but I also checked 1.0 g, 2.0 g, 5.0 g and 10.0 g OIML M2 weights. I'll check the weights and scale again tomorrow in further tests.
Most of the variation came from the position of the weight in the pan I had set the tare with. I moved the weights around with the tweezers and was able to make the readings vary by .001g or so. With an actual weight, i.e. powder, that isn't so concentrated in a small area, like a check weight, it will probably give very repeatable results.
I may hook this scale to an inverter, to get better control of the voltage being supplied. Being in rural America, the electric coop's power does vary. A battery, as the source of power with a float charger and inverter, should provide pretty constant voltage, or I can go to a regulated power supply.
The included "Vibrakill" pad seems to be effective, even if it is just a small high density foam pad.
The leveling adjusters worked fine in setting the bubble level.
I'll also see tomorrow if the sensitivity will allow small additions of weight to give a repeatable result.
As an update, I just bought
As an update, I just bought the Gempro 250 from [url=http://www.oldwillknottscales.com/index.asp?PageAction=VIEWPROD&ProdID=291]Old Will Knott[/url] and in a quick check, it seems to be accurate to +/- .001g. I used the 20.0 gr OIML F2 weight that comes with the unit, but I also checked 1.0 g, 2.0 g, 5.0 g and 10.0 g OIML M2 weights. I'll check the weights and scale again tomorrow in further tests.
Most of the variation came from the position of the weight in the pan I had set the tare with. I moved the weights around with the tweezers and was able to make the readings vary by .001g or so. With an actual weight, i.e. powder, that isn't so concentrated in a small area, like a check weight, it will probably give very repeatable results.
I may hook this scale to an inverter, to get better control of the voltage being supplied. Being in rural America, the electric coop's power does vary. A battery, as the source of power with a float charger and inverter, should provide pretty constant voltage, or I can go to a regulated power supply.
The included "Vibrakill" pad seems to be effective, even if it is just a small high density foam pad.
The leveling adjusters worked fine in setting the bubble level.
I'll also see tomorrow if the sensitivity will allow small additions of weight to give a repeatable result.