Using a digital scale to weigh your canisters is instrumental to ensure you don't overfill your fuel canisters. This digital scale lets you weigh your isobutane fuel canisters to ensure an accurate fill and avoid potential safety hazards. There are plenty of digital scale options on Amazon, some more expensive, and some less. This is the one we use.

Digital Scale Specifications

Color & Finish: Matte Silver
Weighing Surface: 3.94 Inches Square
Type: Compact Digital Scale
Size: 4.92 Inches by 4.13 Inches by .71 Inches
Load Rating: 3kg
Power Supply: 2 AAA batteries (not included)
Model Number: Compact Digital Scale
Material: Plastic Body Housing & Stainless Steel Tray
LCD Viewing Screen Size: 17.32 inches by 7.1 inches
Display Type: LCD
Rated Capacity: 500g/3kg
Brand: ACCT
Backlit Color: Blue
Scale Accuracy: 0.01g