February 12, 2018
Small, light, enables control of air flow and lets you save partially used cartridges.
Easy to lose, Does not lock on to Presta valve securely. Requires practice to master.
Have wasted a couple of cartridges figuring out how to use this. Be sure control knob at end is fully closed (turn clockwise until it stops) before cracking cartridge. Must clamp chuck very firmly over the valve with your hand (wrap around tire and rim) or it will leak. Slowly release air with counter clockwise turns. Or, get pricier unit with positive lock to the valve.