Hollis Pony Bottle Gauge Instruments Mask is equipped with easy

Mask is equipped with easy squeeze-to-adjust buckles that are mounted behind the lens for a more hydrodynamic design

developed and tested by technical divers and 3 years in the making

200 cubic inches (36 liters) and weighs 2

and without modification

Hollis Pony Bottle Gauge Instruments Mask is equipped with easyThis products Overview The Pony Bottle Gauge is a tiny gauge that easily connects to the 7 16" high pressure port of your pony bottle regulator or other alternate tank regulator to show pressure in an easy to read display. Any diver who has used a pony bottle knows the hassle involved with trying to find out how much air is in the tank. Switching regulators to view the primary pressure gauge or adding a separate pressure gauge to the pony bottle is a