Usage Tips:This is a great tool set for refrigerant testing, charging and evacuation. Can be used on all car A/C, commercial and domestic A/C and refrigeration systems. With built-in safety valve to prevent accidental venting of refrigerant. This refrigerant recharge kit is made of corrosion-resistant metal, the hose rubber material, high pressure resistance,reliable and durable in use. Used to check low side pressure for accurate fill of your air conditioner. AC Gauges, Automotive AC Gauge Set for R12 R22 R404A R134A factory tested, excellent working performance. Perfect for car air-conditioning to add refrigerant. Product function: This product is mainly suitable for the pumping and pressurizing operation of refrigeration maintenance, used for refrigerant filling of air conditioning system, and displays the real-time system pressure. Note:Compatible models are for reference only. Please confirm whether it is suitable when placing an order. Can not Due to different production batches, the label words on the product are random and cannot be specified. The actual product may have slight differences or color differences. This does not affect the applicability. Colour:As Shown Material:Plastic+Metal Package Contents: 1 * refrigeration manifold gauges set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.