Average Reviews:
(More customer reviews)I previously had an American Weigh Gemini-20 scale I would use in my research, which is similar to this but slightly less accurate. I recently began pharmacodynamic characterization studies of a few compounds for which the greater accuracy provided by this scale would be beneficial.
Relative to the Gemini 20, the build quality is much higher, and the attention to detail is much finer. The scale body, the cover, even the mating of the battery door to the unit just scream of "somebody actually thought about this". My Gemini 20, while reasonably accurate, always sort of half-felt like it could just randomly disintegrate if you picked it up too fast. There's also a very nicely placed mating set of concentric rings between the load cell and the weighing dishes, making it impossible for the dish to slip and contact the scale body. No dime mod needed here!
The accessories it comes with all seem higher-quality too. A very nice vinyl zipcase with foam padded cutouts for the scale and a set of tweezers on one side, and two mesh pockets for the two weighing dishes. This trend does not continue with the included calibration weights though. Both the Gemini 20 and the Pro (once calibrated with a bit better set of OIML M1s) were reading them both as around 10mg underweight. Granted, that won't make a huge difference over the total range of the range of the scale, but it's definitely an issue.
The scale is definitely accurate to +- 3mg or better as claimed in the manual, but like the Gemini 20 it has problems registering very light things. It's just completely off under 10mg, with accuracy increasing up from 10mg to roughly the 25mg mark. Excellent technique and checking with calibration weights is definitely a must when weighing between 10-25mg on this scale.
All in all I'm quite impressed with this scale. The design and construction are well thought out, and it's probably the most accurate scale in it's price range. Recommended.
Click Here to see more reviews about: American Weigh GPR-20 Gemini-PRO Digital Milligram Scale, 20 by 0.001 G
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