The NAVAC NRS2i01 Bluetooth Wireless Electronic Refrigerant Scale is designed and reinforced with advanced technology, providing more precise and portable refrigerant charging technology. Through the Bluetooth connection between handheld device and electronic charging scale, you can perform other tasks while charging. While real-time refrigerant charge is transmitted to the handheld device, it will buzz when the charge is within 2 oz of the setting, and alert the operator to stop the charging once the setting is reached. The magnesium alloy weighing pan and ergonomic, one-piece, portable design make it lighter and easier to carry.