TIF Instruments TIF9030 Compact HVAC Refrigeration Charging Scale is designed to weigh refrigerant up to 220 lbs (100kg) with 0.1 oz resolution and accuracy within ±0.5oz. The TIF9030 features lbs, oz, decimal lbs, and kilograms units, compatibility with most 9"x9" tanks, and 3 button operation with ON/OFF, automatic zero, and switchable units.