The overall length of the hose is 12 in and it is designed for suction (low) side readings only. Both ends of the hose are 1/4 in low loss fittings with one end being a button style depressor which is designed for precise metering of refrigerant. The face plate of the gauge shows PSI on the outside and has optimal pressure ranges for 3 different refrigerants. PRO CHARGE™ Charging Hose, 1/4 in Nominal, 12 in Length, Domestic