Robinair TIF9030 Compact Refrigerant Scale Robinair's 220 pound (100 Kg) refrigerant scale features an ergonomically contoured molded housing with handle that is easy to carry and store With high accuracy (0.5 oz.) and resolution (0.1 oz.), along with an easy to read display that shows measurements in lbs./oz., decimal lbs., and kilograms - this versatile scale is ideal for professional A/C technicians Simple to use with just 3 control keys to manage functions: On/Off, automatic zeroing, and measurement units Generous 9 inch square platform accepts most tanks - perfect for both charging and recovery Powered by one 9V battery (included)