3-1/2" gauge has dual scale with ranges from 0-400 psi and 0-28 BAR Quick coupler connection on gauge assembly for fast, easy changing of gauge to the hose assembly 2-1/2" gauge has dual scale dial with ranges from 0-100 psi and 0-7 BAR; hook on gauge allows technician to hang gauge and hose assembly out of harms way 6 ft. hose for easy gauge viewing & the ability to test the vehicle from the driver's seat Custom blow molded case for convenient storage Set of 21 adapters included: (11) aluminum metric (7) brass NPT (3) steel fractional