A method of measuring weight of the refrigerant recovered and a device for refrigerant recovery and recharge device is disclosed. In the arithmetic coding phase, several opportunities exist for minimizing complexity and improving compression and computational performance as compared to existing systems. The conductor track supporting layer has indentations which are located in the area of the connecting areas and which are filled with the screen printing paste during the screen printing process. The attachment portion includes a first mounting arm and a second mounting arm configured to be positioned about the rail assembly when the accessory is snapped about the rail assembly.