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Do you mean to say that you use it to check how much gas you have left in the tank? Can you elaborate on how you do that meaning how much of a weight difference you looking for?
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Just buy the cheapest you can find on Amazon or eBay
There's usually a tare weight embossed on the propane tank. Weigh your tank with a scale, subtract your tare weight and you know how much propane you have left.
Exactly! Keep in mind a refill might only be 75% of capacity to allow for expansion, but this proves to be more helpful than just knocking on the rank. And for under $7? Great find by the OP.
Btw, quick YouTube video with an analog scale, but you get the idea:
https://www.youtube.com/watch?v=D6E3HVV
Anyway the product is solid. I weighed my bags before going to the airport and it was right on... we are talking within a pound compared to the airport scale.