This is the Mares Mission 1 Compact Pressure Gauge for Scuba Diving Features: Mares Mission 1 Compact Pressure Gauge, Imperial Compact Lightweight Ergonomic Design Dimensions: 5.2 x 2.8" x 0.9" (132 x 70 x 23 mm) Weight: 9.88 oz (280 g) Florescent Dial for Easy Reading Day or Night Color Coded for Safe Air Reserve Readout: 0 to 5,000 psi 500 psi Color Coded in Red Impact-Resistant Boot Eyelet for Attachment of Clip or Lanyard 360Adeg Swivel and 36" (90 cm) HP Hose Hose: 7/16" UNF Neoprene Jacket Double Braided Mares, has always paid special attention and devotee&';s its self to ergonomic design. The material used, is highly shock resistant elastomer to protect the gauges accuracy, and affords a secure grip in every situation with any type of glove. The Compact Pressure Gauge has a florescent dial for easy reading in day or night diving situations. Face of Pressure gauge is color coded for safe air reserve in a glance. "