1Precise Gauge: This tool has easy to read large dial with color coded scale pre setted for various refrigerants, and calibration screw are set on the gauges allowing for fine tuning, and a transparent sight window is located on the middle of the manifold for monitoring charging and recovery. 23 Tubes: The kit includes three extra long 90cm freon charging hoses in three colors for easy identification, red for high pressure, blue for low pressure, and yellow for refrigerant bottles. 3Durable Material: This tool kit is made of aluminum, solid brass, PVC and plastic material, which can withstand heavy use and accidental falls. And it is the ideal choice for professional auto mechanics. 4Practical Function: This tool kit has the main function that is to diagnose, examine and restore the work of the air conditioning pressure meter. 5Easy to Use: This air conditioning fluoride tool is easy and convenient to use, which has no complicated operation for you.