This Air Down Gauge has three convenient functions: quick, hands-free, continuous deflation; intermittent air-bursts for fine-tuning; and a 2-inch inline gauge that's accurate to within 1%. Protected by a rubber bumper guard and shipped in a zippered pouch, two Air Down models are available: 0 to 35 psi and 0 to 60 psi, both in 1 psi increments.