Try this on for size. The miniature Pony Bottle Gauge is a fully functional submersible pressure gauge rated to 5,000 psi. Ideal for back-up air supplies or decompression tanks, the Pony Bottle Gauge is the perfect accessory for use with wireless PDC's, allowing you to quickly pressure check your cylinder without linking your receiver unit.
Threads directly into any standard first stage high pressure port
Nitrox compatible to 100% O2
Large numbers and green, yellow and read indicators for easy monitoring
One-way safety valve Readings to 5,000 psi