Smart WeighGEM20-20g x 0.001 grams, High Precision Digital Milligram Jewelry Scale, Reloading, Jewelry and Gems Scale, Calibration Weights and Tweezers Included

This is a great little digital scale. I make jewelry, so I have to measure in both grams and carats frequently for precious metals and gemstones. This scale is perfect, as it weighs up to 50 carats (20g) with accuracy to plus/minus 0.001g. I've found it to be very accurate, though if using the separate tray that comes with it and the TARE function, I generally do several measurements to be sure. Do ensure that you place the tray on the center of the plate, or you can get inaccurate readings. Always make sure the scale is placed on a flat supportive surface, which also helps ensure accuracy.Calibration is very easy, and this should be done before the scale is used. If you have lost the manual, I have posted the process from the user manual in the questions section since a couple of the answers were not correct for the 20g model of this scale.I noticed that some reviewers have said the scale is flimsy and easily broken. I have not found that to be the case, but I don't keep the scale itself on my workbench. Instead, I keep the scale and the included components in the original case as it is lined with form fitting foam. I then store it and my larger scale on a separate shelf unit next to my bench that does not get jarred. If you keep it in the box, you'll also have less chance of losing the tiny components that come with it along with the second calibration weight and the handy user manual!I've used the scale for several months now, and my judgment is that it is a keeper. The manual also is in good English (rather than a bad translation from another language), another bonus! The instructions are in several other languages, including French and Spanish.

I am very pleased with this scale. It came from the factory calibrated with a note to recheck calibration before using. I found it to be spot on using the accompanying weights to recheck the calibration. In use I found the tare function to work very well. I also found the scale to have good repeatability when momentarily removing a weight object and then placing on scale again. I’m very happy with the purchase.

Very nice unit

This is a very nice scale for the price.As others have pointed out, once zeroed (when initially turned on, or when tared), the scale will ignore changes in weight below about 5 mg. It's a design choice - questionable, perhaps, but common at this price point. Measuring at a mg level is really touchy: a breeze from your HVAC, your breath, etc., will cause measurements to change. Most people would be annoyed by a shifting zero.As long as you're aware of this, it's not a problem. Start by adding at least 5 mg, then the scale will track tiny additions from there. Or if needing a very small amount, turn it on, add the tray without re-zeroing, add the amount you need to the number on the display, and that's your target. If the measurement is critical, you can check it by dumping the tray into another container, re-zeroing, and dumpimp the material back into the tray all at once.In practice, I wouldn't use this for amounts under 10-20 mg anyway, which I think is very reasonable at this price point.My calibration weights read 10.001 and 9.999, so I didn't re-calibrate.Other reviews noted problems with auto-off. For my unit, how to enable/disable auto-off is covered accurately in the surprisingly readable manual.The scale comes with two 10 g weights for calibration. Both are required since calibration involves checking zero, mid-range, and top-of-range. Oddly, there's a spot in the body of the scale for one of them, and a spot in the box for the other. I suppose the idea is that you can use one calibration weight any time to check mid-range.The box the scale comes in, while just cardboard and open cell foam, is pretty decent, with a nice magnetic closure. It provides for decent storage at least in a reasonably clean, dry environment.

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.