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American Weigh Scale Scalemate Sm-501 Digital Pocket Scale, Silver, 500 X 0.01 G
- Magnetic cover latch allows easy removal of the protective cover/expansion tray
- Back lit display
- Stainless steel weighing surface
- Includes vinyl pouch
- Available in 3 colors
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Top Customer Reviews
This scale appears to have a repeatability within about 0.015 or 0.02 grams, which is probably quite good for the price. It has a brightly backlit display which is easily readable unless you're looking from an extremely steep angle. However, it is programmed with a dishonest "feature"; if it registers a weight within 0.04 grams of any multiple of 100 grams, it will "cheat" and round to the nearest 100. For example, anything registering in the range 99.96 to 100.04 grams will be "locked" to 100.00 grams, and anything from -0.04 to 0.04 grams will be locked to 0.00, etc. This is applied after your tare is subtracted (e.g., if the scale internally registers a total of 131.28 grams and your tare is 31.24 grams, the display will show 100.00 grams instead of 100.04). I tested every multiple of 100 (0.00, 100.00, 200.00, 300.00, 400.00, 500.00) using drops of water in a glass, and the SM-501 does the same thing for each. This issue can be worked around by adding a known weight and then subtracting it in your head, but this defeats the convenience of having a "tare" feature. On the other hand, if you'll never be weighing anything that's close to a multiple of 100 grams then it won't be a problem.
Cut a piece of paper into a 8" x 1" strip and weigh it. It will register about a half gram.
Remove the paper and snip a 1" x 1/4" strip with a pair of scissors and let it fall onto the scale. The scale will continue to register zero as Ellsworth predicts.
Continue cutting strips onto the scale once per second. The scale will continue to register zero for as long as you care to snip!
Regarding auto-zeroing small, slow weight additions, I understand that this is considered a feature for some reason. Like the others I don't know why this would be desirable. For precise measuring, you can gently press on the container or lift it up as you add/sub material. Either disturbs the scale out of that auto-zero mode.
Until now I have been satisfied with this scale - a great deal for email@example.com. But after less than a year the buttons have started wearing out. I now have to firmly press and wiggle the power button to turn it on, and the tare button has started degrading as well. That is why I only gave it three stars.
Experienced precision is about 0.02 grams. I never came across the effect D. Ellsworth described as I never measure exact multiples of 100 grams.
Ordered the same scale for a friend a year ago. It was way off from first use with recalibration not possible, and after describing the problem by email, I got a replacement without hassle which works fine ever since.
But that experience emphasized that owning a 500 gram calibration weight for testing is an absolute MUST.
This scale will weigh items up to 1.1 pounds. If I had gotten a scale that weighed in increments of 0.1 gram, I could have gotten a scale that would weigh up to 4.4 pounds. That would have more overall usefulness.
I knew this scale was small, but it surprised me how small it is. Check out the dimensions to be sure they or ok. The scale platform on mine is a little crooked, so they have a little quality control problem there.
BE SURE NOT TO PUT TOO MUCH WEIGHT ON THESE SCALES. TOO MUCH OVERWEIGHT CAN DAMAGE THEM.
Most Recent Customer Reviews
I cannot say how this might have worked had I kept it; but I sent it back since it ended up being far too sensitive for my needs, and it was hard to get an accurate reading before... Read morePublished 17 months ago by BobbyB
Works as advertised. It seems to stay in calibration pretty well, but it stays at home with me so it doesn't get jostled much.Published 20 months ago by C. Ward
This scale is perfect foe my needs. It's small footprint makes it unobtrusive on my workbench. I have used it several times since it arrived and it has functioned perfectly.Published on January 14, 2014 by Terry Jenkins
Very accurate and reliable. Love its small size and bright screen, and this is one of the few digital scales that can read 2 decimal placesPublished on December 1, 2013 by Daniel Yee
This is a great buy for the price! Works well in the hundredths and tenths with decent weight on it! I have bought it before but had spilled liquid on it, they are not water proof! Read morePublished on October 30, 2013 by Jake
Not sure if the scale, or the 500 Gram weight aren't exact, but one of the two read this incorrectly. its only off by like... 0.001 or something... Read morePublished on August 30, 2013 by Steven B.