IST's Pony bottle gauge is a mini package with lots of convenience built-in. It easily connects to the high-pressure port of your pony bottle regulator or other alternate tank regulator to show pressure in an easy-to-read display.
You know the hassles involved with using a pony bottle and 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 an inconvenience. Problems over, with IST's mini SPG. It has a pressure range from 0-350 BAR, an easy to read display and comes equipped with a high-pressure O-ring for immediate installation. This is a great, must-have accessory for your dive bag!