This is a great little scale that's easy to carry around and easily fits into a pants pocket or backpack compartment. The screen is bright and it has a simple four-button interface (on, off, unit measure, and tare. The milligram-level of precision is handy (more than I need, but remember you'll never regret it if you have too much precision and always regret it if you don't have enough).
The included bowl is small and depending on how granular your product is, it can only handle about 2 to 4 grams at a time.
TIP: You don't have to use the included bowl. Products can be weighed right on the platform. An even better alternative is a small glass bowl, the kind for holding measured-out spices and things for cooking. If the bowl is over 20 g, the scale will read o/l (overload), but you can tare it, add product and get an accurate result.
I've been using the same scale for 2 years and use the included calibration weights to test it regularly. Calibration is always perfect: the 10 g weight gives a 10.000 gram readout every time.
I bought this online and it was inexpensive compared to the scales at my local smoke shop. I use it mostly to verify my purchases, and occasionally to weigh out 100-250 mg quantities.
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American Weigh Gemini-20
American Weigh Gemini-20 Portable Milligram Scale 20x0.001g