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⚖️ Precision that professionals trust — weigh your world with confidence!
The Smart Weigh GEM20 is a high-precision digital milligram scale offering 0.001g accuracy, ideal for jewelry, gemstones, pharmaceuticals, and reloading. Featuring multiple measurement modes, built-in calibration weights, a protective flip cover, and battery status alerts, it combines laboratory-grade reliability with portable convenience. Backed by a 2-year warranty, it’s engineered for professionals who demand exactness on the go.













| ASIN | B00ESHDGOI |
| Best Sellers Rank | #10,691 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #648 in Test, Measure & Inspect |
| Brand | Smart Weigh |
| Brand Name | Smart Weigh |
| Color | Silver |
| Customer Reviews | 4.4 out of 5 stars 5,676 Reviews |
| Display Type | LCD |
| EU Spare Part Availability Duration | 60 days |
| Form Factor | Mini |
| Global Trade Identification Number | 00700358199127 |
| Included Components | Calibration Weights |
| Item Weight | 4.25 ounces |
| Manufacturer | Smart Weigh |
| Material Type | Stainless Steel |
| Measurement Type | grams |
| Model | GEM20 |
| Part Number | GEM20 |
| Readout Accuracy | Example: 0.001 g |
| Recommended Uses For Product | weighing jewelry, weighing gemstones, weighing medicine, reloading, laboratory use, weighing gold, weighing pharmaceutical powders, weighing chemical supplements Recommended Uses For Product weighing jewelry, weighing gemstones, weighing medicine, reloading, laboratory use, weighing gold, weighing pharmaceutical powders, weighing chemical supplements See more |
| Special Feature | high precision 0.001g accuracy, built-in calibration weights, multiple measurement modes, flip cover protection, tare function, portable design, LCD display Special Feature high precision 0.001g accuracy, built-in calibration weights, multiple measurement modes, flip cover protection, tare function, portable design, LCD display See more |
| Special Features | high precision 0.001g accuracy, built-in calibration weights, multiple measurement modes, flip cover protection, tare function, portable design, LCD display |
| UPC | 885305222797 885697786334 885474837464 700358199127 621011632778 723120986596 735343133787 798256080227 |
| Unit Count | 1 Count |
| Warranty Description | 2 year warranty |
| Weigh Scale Type | Counter Scale |
| Weight Capacity Maximum | 20 g |
| Weight Limit | 20 g |
F**T
Reliable
Works well. Still holding strong after a year+. Hasn't given out the way other affordable scales often do. Although I did buy this when it was cheaper, so it was better value, I think it is still worth the money if you need a decent and fairly precise scale without getting some $300+ scientific scale. If you need consistent guaranteed accuracy in roughly increments of 5-10mg, this is great; if you need insane precision, this is not it. Outperforms most others I've used in this price range (which isn't a giant sample but I've tried a few others).
J**N
Great Scale for a Great Value, Very Accurate For This Price Range!
Weight Tracking: This is pretty accurate, from my own testing there is about a 1-3 mg deviation in accuracy which is pretty impressive for a cheaper scale. I measured the accuracy with a mg weight set I bought alongside this one. One must assume that the weights themselves are also not 100% accurate, so this scale could potentially be even more accurate then that. Usefulness: This is pretty useful for anyone needing to measure things with fairly accurate results, but does not want to spent hundreds of dollars on a scale. Informative: The scale offers a number of different weight options, it is important that you read the manual for properly taring and all of that. This scale is very sensitive, so following the manual is important. Speed: It's a bit on the slower end, but that's ok it doesn't take long, but it is a good idea to give it a second or two and try not to breath on it because it's very sensitive and even a breeze could potentially offset the weight by a +/- 1 mg. Size: It's compact enough and easy to transport, the packaging is magnetic which is nice, so be careful to make sure you realize this and don't tear up the packaging in an attempt to open it.
H**R
Powerful Precision Weighing Scale When Accuracy is Critical
This is a fabulous High Precision Digital Weight Scale. I am most pleased I can push a button, weigh my measuring unit, then hit the button on the left, which subtracts the weight of the weighing tray so that the screen reads 0.000 g and then, since I need to have precisely 0.015 grams of a powder, easily get this precise amount. Then, with a large flip open cover, I can leave the weighing tray on the unit, my weighed power in the weighing tray, put down the cover to protect the powder, and have this meager dosage ready to take with my 120 mg. dosage of Armour Thyroid medication for my thyroid at 4:00 a.m. I don't even have to find my bifocal glasses to see anything! Doing this, this way, saves me over $50 monthly. , I couldn't have asked for a better product to assist me. I did a lot of research to find the proper scale, and this one easily meets all my powder needs for any of my multiplicity of supplements where the dosage is 1/8th of a teaspoon or less up to 20 grams. Currently I use other teaspoons which I level off with a knife. And, once I figure out how to use a drop, a smidgen, a pinch, a dash or a tad, I will be using those measuring tools with this unit as well. Additionally, I could use this unit because it also weighs oz, ct , ozt, dwt, gn, and utilized high precision sensors to ensure the advanced accuracy of 0.001 grams and capacity of 20 grams. The set comes with a set of tweezers, weighing tray, with a dipping area if you are working with fluids, and two 10 kg calibration weights. The unit also features a flip open cover to protect the scale's platform besides a back lit screen for easy visibility. In fact, since the summer of 2014 I have been having hypothyroid issues, where my dosage of Armour Thyroid has had dramatic swings, the loss of 40 lbs. over 3 months, the weight gain of 40 lbs over 2 months, and intense chronic fatigue, etc. Then, when I learned (no benefit of my MD or Pharmacy) to separate iron and magnesium by 4 hours before as well as after my thyroid pill consumption, my thyroid medication settled down to more normal numbers. But, my thyroid is still in a state of flux. I also commenced dicing a raw beet a day to assist my thyroid as well as eating 2 Brazil Nuts daily for my selenium level. This caused my thyroid medication to be reduced to 135 mg. daily from 150 mg and may again decline as my system gets regulated with beets, Brazil Nuts, and no magnesium or iron within 4 hours either side of my thyroid medication. Yet, this dosage of 135 mg. is not a normal one and becomes 2 prescriptions, and thus costs me for 2 prescriptions. Got to love the drug companies who've really figured out how to .... I refused to purchase the 0.015 mg dosage (the size of a tiny nail head). But, I've a goodly supply of 300 mg thyroid medications, which I was slicing into 1/2 or 150 mg which would cost me for 1 prescription and last for 2 months, thus saving me $50. My dosage used to be 90 mg. This kept my medical cost reasonable. So, I ground up the excess supply into powder. Each evening, I use my Heathrow Scientific HD 15909 Spatula with Flat End and Spoon End, 9" Overall Length, to select a wee amount of this powder, and put it in a measuring cup on this scale. It is so easy to get precisely 0.015 grams. If I need tweezers to select a smaller amount of powder, I do that as well. One of the greatest features of this Smart Weigh is the fact you can easily weigh the tare (weighing tray), and once you have that, that tare weight unit is known by the system. Then, push the button on the left, your scale will read 0.000. This makes it so easy for me to read precisely 0.015 grams. I truly hope this information is of help to you. And if any of you have thyroid issues, it doesn't matter which thyroid medication you use, the thyroid medication will not work correctly unless you separate by 4 hours your taking of magnesium or iron, and iron is in everything except for milk products and a few candies. Even yogurt which has fruit on top has iron in it and will interfere with your medication. This period is 8 hours and not a millisecond less! I'm so glad I made this purchase and it has a place of honor on my kitchen counter.
B**T
Nice Little ACCURATE Scale
More accurate then my $170.00 OHAUS YJ103 Jewelry/Gold Scale, I compare the weights I was getting against the YJ103 Digital scale and my trusty OHAUS Made RCBS 10-10 Beam scale and the readings were close to perfect if you plan on using this to weigh in Grains for Reloading. Now the reason I gave it only 4 Stars is because of two Minor things. #1 It has no Built in Bubble level nor can you screw the 4 Pads/Feet on the bottom to make it level, which is a necessity if you want accuarte weights, I plan on buying a small piece of flat Marble Floor Tile from Lowe's or HD to set this little bugger on and to that I will install 4 little pads that can be adjusted in or out. #2 The weighing area this scale is about 1.5" round (About The Size Of A Checker Game Piece) which has a stamped impression in it the size of a Quarter, which is just big enough for the TINY TINY pan they include in the box, I tried to use the Bigger Plastic Pan that came with my OHAUS and it fit but was unstable because of the recessed stamped impressing in the middle, I found that if you moved it (Bigger Pan) a tiny bit the readings were all over the place, So I'm going to search and see if I can find a nice little pan that will fit so I can Trickle Powder into it. Other then that this little scale is worth every Penny of the $16.00 I paid, In fact I wish I would have purchased this Brand instead of the JUNK OHAUS I'm now stuck with and DO NOT TRUST.
A**M
Fantastic long lasting scale that hasn't failed me yet.
I've had this for 6 years now, it's continued to work fantastic. It's pretty high quality and have used it to measure out peptides many times. I don't use it much, and might have had to replace batteries once since I've had it, so great battery life. It's small and lightweight, can fit in a coat pocket or any drawer. Super easy to use and calibrate. It's increased by 50% since I bought it, sigh. I recommend it.
L**N
Mr.
I am totally pleased with my scale. The scale works perfectly just follow the instructions!
A**.
You can't find a better scale than this!
I've used this same scale for around a decade now and it never fails to amaze me at how high quality it is! It usually lasts me a few years and only breaks due to human related issues (e.g. dropping it too many times) and even then, it's very surprising at how much it can take before problems do actually start to occur. The case/box it comes in is very sturdy and helps keep it safe and secure when you're not using it. It's also very easy to calibrate due to the two 10g weights that it comes with, and the instructions tell you how to do it in just a minute or so. Overall, it's absolutely unbeatable in every way whatsoever and I highly recommend it to anyone needing an accurate milligram scale without spending a fortune.
B**K
What A Piece Of Crap
Other than books, this is the first item I’ve ordered from Amazon. From start to finish it’s been a horror show. Amazon’s packaging and shipping system leaves much to be desired. But that’s another story. As to the scale itself. When it arrived, I first looked at the data on the box. Among other things, it says the contents include two 10 kg weights, used for calibrating the scale. Hate to be the bearer of ill tidings, guys, but a “kg” is a thousand grams. It would be hard to use them on a scale that only measures to 20 grams in the first place. The weights are titularly 10 grams each. I say “titularly,” because, as we’ll see, there is no reason to believe they actually weigh that. The box info also says there’s a set of tweezers included. Hold that thought. Next I opened the box. Included was the scale, the two weights, and a so-called instruction manual. But, alas, no tweezers. There’s a molded cavity where they’re supposed to be. But whoever boxed this scale at the factory must have thought they were an unimportant part of the package, so left it out. The manual, itself, is somebody’s idea of a joke. First off, it’s written in tiny characters. Just guessing, I’d say about five point type at best. Even with a magnifying glass it was hard to read. And the information is self-contradictory. Under the heading “calibration,” there are multi-stage instructions on how to calibrate the scale if necessary. Among them is a caution to check that the readings given fall within the allowable tolerances. “See chart below,” it says, to find out what they are. There is no such chart. The closest is a line in a box that provides specifics about the scale, that says: “Calibration: Self-calibrating.” Uh, huh! Let me get this straight. Smart Weigh provides half a page of instructions for calibrating its product, and then tells you it isn’t necessary to do so. The real crux of the matter is that it certainly is necessary. Turning the scale on, with the setting in grams, the screen---which is very readable, I’ll give them that---zeroed out as it’s supposed to. I then put one of the weights in the center of the pressure plate. After bouncing around, up and down from 10.000, it finally stabilized at 9.999. That’s a full milligram off (unless you measure the way the Smart Weigh does, in which case it’s 9 grams). Repeating this with the second weight was worse. After bouncing around from as low as 9.994 to as high as 10.001, it finally stabilized at 0.996. Four milligrams off (or 4 grams if you prefer). An earlier review at this site suggests that outside conditions cause the fluctuations, and that the problem can be solved by lowering the cover. This doesn’t work when using the weights, because they’re too tall and the cover won’t seat properly. More to the point; with nothing on the pressure plate, closing the cover changes the reading by more than two grams from the zeroed setting. That’s actual grams, not the company’s version of measurements. Next I tried calibrating the scale, using the company instructions. This entails, as a final step, stacking the two weights. Reaching that point, I dutifully placed the second weight on top of the first. Bounce, bounce, bounce, bounce, bounce until finally stabilizing at 19.994. Now six milligrams might not sound like much. But, when you’re measuring doses of herbal medicines (my intended use) that could be a crucial difference. Especially as there’s no way of knowing if it’s really only six off. From all this we can conclude one of three things. One or both of the calibrating weights are wrong, or the damn scale doesn’t work. I’m not in a position to say which. But none of them is acceptable. I returned it to Amazon. And would be leery about ordering anything else from this company.
K**7
Hohe Präzision zum kleinen Preis
Da ich im 0,01 g Bereich genau messen wollte und mich nur diese Nachkommastelle interessiert, habe ich mir eine Waage gekauft, die auf 0.01 g "genau" wiegen sollte. Aber dieses Gerät war für mich unbrauchbar. Es schwankte bei jeder Messung um 0,02 g vor allem bei sehr kleinen Messobjekten war das Gerät absolut unbrauchbar. Ich habe die Waage zurückgesendet und nun diese Smart Weight 0,001 g gekauft. Dieses Gerät entspricht meinen Anforderungen vollkommen. Nach Ein paar kleinen versuchen, habe ich eine maximale Abweichung von 0,002 g festgestellt, für meine Zwecke also irrelevant. Und die Waage fängt auch schon bei sehr kleinen Objekten an zu messen. Nach meinem Test gestern reagierte die Waage schon auf ein 0,006g "schweres" Gewicht. Entgegen einer anderen Rezession, passt bei mir die Wiegschaale perfekt drauf. Es gibt im Messergebnis absolut keine Abweichung zwischen dem Messen auf der Schaale und der Messung direkt auf der Messfläche.
P**N
Excellent service from seller
A good product but unfortunately it cannot measure down to the milligramme. I needed to weigh out medication down to 2 milligammes - the scale cannot pick up such small amounts accurately. The seller provided an excellent service and I had no problems returning the item. Thank you to the seller for such prompt and professional service!
M**G
Pretty accurate.
These are excellent, easy to use, clear display, maybe not the most durable, quite delicate, but perfect for weighing very small supplement doses.
V**L
Perfect find ! 😍
Such an amazing product i found after searching for almost 6 months, i recently got to know that this product is inported from USA no doubt why this product is so promising, highly satisfied 🌸
A**N
Muy buena! Cumple más de lo esperado
Es más precisa de lo que esperaba en cuanto a los mg, aunque si es cierto que puede tener un error de +/- 0.003 mg que la verdad por el precio que tiene y por lo bien que está me parece minimo. Viene en una caja con : la báscula, un par de pesos de 10g, unas pinzas y un cacito metalico que viene muy muy bien para pesar cosas en polvo. En cuanto al funcionamiento es simple, la pantalla esta bien iluminada y la verdad que yo recomiendo no equilibrarla ni nada así porque ya viene hecho, e igual es peor mover los parametros. La calidad de los materiales no es la mejor del mundo asi que hay que ser delicados, pero por el precio es lógico. Poco más que añadir, la recomiendo si es para un uso personal y no profesional.
Trustpilot
2 months ago
2 days ago