This device is definitely not a scientific grade scale. But for the price, it's fine for everyday use. I usually measure out the dry chemical in the aquarium and mix it with the water to save money. For example, I just bought this container of sodium thiosulfate pentahydrate, which is water miscible and will probably provide me with a dechlorinator for the rest of my life! :-) I also mix fertilizer for my aquarium plants. For smaller amounts, you must measure in milligrams. This scale does seem to drift a bit (around 5mg?) after calibrating with the included 10g weight, but that's fine for what I need it for. Inside is a rechargeable battery with an included charging cable. It also comes with a windscreen, which can come in handy when you're measuring powder and don't want to sneeze straight off the scale.
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