has anyone experience with one of these kits? (http://www.elecrow.com/weight-sensor-scales-kit-20kg-p-714.html or http://www.aliexpress.com/store/product/Weight-Sensor-Scales-Weighing-Sensor-Kit-20KG-Range-Used-With-HX711-Amplifier/1306340_2004747557.html).
I think about using one of these to measure the weight of a CO2 bottle for my aquarium (to check how much CO2 is left in the bottle). The weight of the bottle including accesories is appr. 10Kg and it is filled with 2Kg of CO2. A resolution of 10gr would be great. 25gr would also be ok. I think most critical is the long term stability. One bottle last 6 to 9 months and I want to monitor when the bottle is empty a few days before it actually happens.
What do you think. Could I achieve this with a kit like that? The nice part about this kit is that it includes all the mechanics.
Thanks for your help in advance