- Use a Fuel-Measuring Device: Just screw the canister into the device and then suspend the canister from it. The device will provide the weight of the canister. Compare this weight to the weight of a full canister (this is displayed on the canister) to get an idea of how much fuel remains.
- Use the Weight Method: Weigh a full (unused) canister on a scale, note the weight in ounces or grams, and then weigh your used canister and note the difference. This method works best with two canisters of the same size and brand.
- Use the Water Method: Place a full canister into a large pot filled halfway with water (you might have to tilt the canister slightly to let the air under it escape) and mark the water line on the canister with a permanent marker. Repeat the process with the used canister and note the difference between the two canisters. This method works best with two canisters of the same size and brand.
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