HiC said:
OldGuy, how's your scale holding up? I'm considering buying one of these but I have a few questions I was hoping you could answer.
1) Does the lid open all the way so it's flat like it shows
here?
2) Is there an auto-off feature and does it shut off too quickly like some other models? I've had a real problem with this with the Jennings scale I've been using. It always shuts off while I'm in the middle of weighing my stuff.
3) Does it indeed recognize weights as low as .01g? My Jennings doesn't seem to go any lower than .03, even though it has a .01g resolution. There are a couple reviews on Amazon for the AMW-100 that mention a problem with this:
here and
here. In the comment for the second review, the guy says you basically can't expect .01 accuracy with a consumer-grade scale, even if it claims that resolution and that you need a $150+ milligram scale for genuine accuracy.
HiC,
My scale is holding up fine, but there's no reason it shouldn't. I handle it with care, I never overload it, and I always put it back in its original (now a bit tattered) box. But, I'm probably being a bit overprotective; the case appears to be sturdy, and I probably could safely store it in a desk drawer. I wouldn't have recommended it otherwise.
Yes, the lid lies flat just like in the photo.
I tested the auto off feature as follows: Turned scale on and pressed tare. Scale turned off after ~ 60 seconds of inactivity. Turned scale back on, placed a twig on the scale for a few seconds and removed the twig. Scale turned off ~ 60 seconds after removing the twig and no further activity. Turned scale back on, placed twig back on scale, removed twig after 55 seconds, scale returned to zero, replaced twig on scale. Scale turned off ~ 60 seconds after replacing twig and no further activity. So, if you're going to have more than ~ 60 seconds of continuous inactivity, lift and replace your sample cup periodically.
I did a crude test at the low end of the range that I think will answer your question. Placed a large twig on the scale, display read 0.07. Added a small twig, scale read 0.11. Removed large (70 mg) twig, scale read 0.00. Returned large (70 mg) twig, scale read 0.11. Removed small twig, scale read 0.07. So, yeah, the scale "knows" its limitations. I do not expect this scale to accurately measure that small a weight, nor do I need it to do so. I bought two of these and compared them. After calibration, they gave practically identical readings at several test points, using a stack of coins as crude/average variable test weight. I was happy with that.
Like anyone else, I want accuracy, and I believe I get it from this $15 scale,
having a reasonable expectation for my application. As I have pointed out, a good portion of what you buy by the gram can be moisture content, so actual weight can change with time. For myself, I just can't justify the additional cost or hassle factor (vibration, air currents, etc.) of a more sensitive scale
for my intended purpose.
Two additional considerations:
If you plan to weigh your samples to the nearest 1/10 of a gram (0.1), I suggest getting a scale that measures 1/100 of a gram (0.01), then round the measurement up/down yourself to the nearest 0.1 gram. That's the resulting resolution I expect from a scale in this price range (0.01 gram dumbed down by me to 0.05 gram resolution).
When I tell someone that my log vape uses ~ 30 mg (0.030 grams) per bowl, it's because I weighed the total contents of several bowls and divided the total weight by the number of bowls I put on the scale. That's how I get "accuracy without precision".
Hope that helps.