Our refrigerant scale features a professional-grade, high-precision sensor with a maximum capacity of 220 lbs. Accuracy: ±0.05% of reading + 5g; Resolution: 5g/0.1oz. This freon scale provides readings in 4 units switching options: lbs/oz/kg/lbs+oz. The refrigerant scale with 12 buttons can set the charging/recovery value, when it reaches the set charging value it will alert with beep sound then please close the valve: Our refrigerant scale features a professional-grade, high-precision sensor with a maximum capacity of 220 lbs. Accuracy: ±0.05% of reading + 5g; Resolution: 5g/0.1oz. This freon scale provides readings in 4 units switching /oz/kg/ refrigerant scale with 12 buttons can set the charging/recovery value, when it reaches the set charging value it will alert with beep sound then please close the valve. The 9-inch by 9-inch weighing platform is equipped with anti-slip rubber mats to reduce the sliding of refrigerant tanks. The scale is equipped with a high-quality aluminum alloy frame, ensuring stability and durability. It is compatible with refrigerant recovery tanks of different sizes. When the load exceeds the maximum capacity (100 kg/ 220 lbs.), the remote control will display "FULL" and the buzzer will give an alarm, thus avoiding damage to the unit due to overload; It also comes with an auto-shutdown design: the machine will automatically shut off after 10 minutes of non-use to protect battery life, Backlight will be automatically off after 10 seconds. Hold the button for 3 seconds until the buzzer beeps once, the backlight will be always on. The high precision electronic refrigerant charging weight scale is compact in size; The package also comes with a storage case to better protect the unit and makes it easier for you to carry it around; The refrigerant scale is suitable for most of the refrigerants and is a perfect choice for HVAC and refrigeration work