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  • American Weigh GeminiPRO GPR-20 Digital Milligram Scale 20g x 0.001G
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American Weigh GeminiPRO GPR-20 Digital Milligram Scale 20g x 0.001G

57 customer reviews
| 4 answered questions

List Price: $129.95
Price: $51.99 & FREE Shipping. Details
You Save: $77.96 (60%)
In stock on September 10, 2015.
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Sold by EZ SELL and Fulfilled by Amazon. Gift-wrap available.
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  • Weighs up to 20 grams in 0.001 gram increments
  • Comes with protective case, tweezers, (2) 10g weights and 2 weighing trays
  • The flip-down shield protects the delicate weighing surface
  • Powered by 4 AAA batteries (included)
  • Backed by a powerful 10 year warranty
2 new from $51.99

Back to School in Kitchen & Dining
$51.99 & FREE Shipping. Details In stock on September 10, 2015. Order it now. Sold by EZ SELL and Fulfilled by Amazon. Gift-wrap available.

Frequently Bought Together

American Weigh GeminiPRO GPR-20 Digital Milligram Scale 20g x 0.001G + Norpro 3080 Mini Stainless Steel Measuring Spoons, Set includes ( tad, dash, pinch, smidgen and a drop ) + SE DD301 4-Piece Spatula Set
Price for all three: $64.02

Some of these items ship sooner than the others.

Buy the selected items together

Product Description

Package Quantity:1  |  Style Name:BLACK

The all new GeminiPRO milligram scale offers a 1 milligram readability with a 20g capacity. The removable weighing platforms make removing samples easy. Great for weighing precious gems and other valuables. All scales backed by our 10 year warranty.


Product Details

Package Quantity: 1 | Style Name: BLACK
  • Product Dimensions: 5.5 x 7.6 x 2.2 inches ; 0.8 ounces
  • Shipping Weight: 14.4 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • Origin: China
  • ASIN: B003STEJD4
  • Item model number: GPR-20
  • Average Customer Review: 3.4 out of 5 stars  See all reviews (57 customer reviews)
  • Amazon Best Sellers Rank: #90,151 in Kitchen & Dining (See Top 100 in Kitchen & Dining)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

54 of 54 people found the following review helpful By Georg Rackley on May 1, 2011
Style Name: BLACKItem Package Quantity: 1 Verified Purchase
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.
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21 of 21 people found the following review helpful By Kodz on June 27, 2011
Style Name: BLACKItem Package Quantity: 1 Verified Purchase
The design lends itself to accurate, easy measurement. Accurate to within about +/- 3mg, which isn't bad for a scale of this price. Comes with two trays, two calibration weights, and a nice storage case. I previously had the Gemini 20, and it was useless. Unless the tray was seated meticulously, the scale would be off drastically. I was a bit apprehensive to get this one after my experience with the Gemini-20, but it's a great scale for the money. I wish it came with a metal tray instead of just a plastic one, but that's not a big issue.
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10 of 10 people found the following review helpful By WhtHawk on February 10, 2012
Style Name: BLACKItem Package Quantity: 1 Verified Purchase
The American Weigh Gemini-PRO is an economic scale to measure small weights. The scale came with batteries included, which is a very nice touch and has two different weighing bowls for different items. The display, while not back-lit, is easy to read and includes a marker for the current 'tare' weight zero. An unexpected plus is this scale will display negative weights if the scale is zeroed in its normal reading range and weight is removed from the platform.

Unfortunately, the documentation leaves much to be desired. The directions for calibrating the scale are incorrect; you push the [UCAL] button after you place the mass requested by the scale, on the weigh platform. Also disappointing, was the capacity of the scale, 20.000 grams, does not include either of the weigh bowls, so the total capacity for most items will be reduced by the weight of the weigh basin, the heaviest being about 1.8 grams.

A note that may be important to some looking to purchase this scale, the total capacity of the scale is 20.000 grams with readout in increments of 0.001 grams; it is only accurate to within +/- 0.003, and will not read a weight less than 0.003 grams. Basically, this scale is for those people looking to be economical and accurate at 0.01 grams; if you're looking for true milligram accuracy, you may want to look at other options.
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17 of 19 people found the following review helpful By Johnny Friday on August 24, 2012
Style Name: BLACKItem Package Quantity: 1 Verified Purchase
This is my first personally owned digital scale and I decided to not go with the lowest priced models.

This scale is surprisingly accurate, and holds calibration well. I weigh all of my spices with a 10g weight left on the tray because in general, digital scales are not as accurate at the bottom end with small weights. I basically take for granted that this scale is accurate to +/- 5mg.

The case protects the scale well, and the included forceps are a nice touch. So far the scale has performed admirably and I couldn't be happier. My only hope is that this scale has longevity and I am able to use it for some time.

To calibrate, make sure tray is properly inserted. Turn on, and hold calibrate. When 10g is shown, place a 10g weight in the center of the tray and press calibrate. Press calibrate again and stack the other weight when the scale reads 20g. Press calibrate again. When it finishes calibrating remove either 1 or both weights depending on the weight of the item you are measuring. For anything less than 250mg I leave a 10g weight centered on the tray.
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10 of 10 people found the following review helpful By L. S. Fischer on August 22, 2011
Style Name: BLACKItem Package Quantity: 1 Verified Purchase
This is the best small scale I've come across for the price. I was skeptical about
accuracy down to .001 gram, but I tested this against other scales and it really is
excellent.

I would have liked to have the tray a bit larger, but I am not complaining.

Comes with calibration weights, instructions, and a handy case which fits everything very
nicely and makes it ideal for travel. Without the case, the scale can fit it one's pocket.
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American Weigh GeminiPRO GPR-20 Digital Milligram Scale 20g x 0.001G
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