The Hollis Prism 2 is a pretty sleek-looking unit, and it has got some serious technical chops to boot. Plus there are a few options for divers, such as choosing between electronic or manual control options and back-mount or front-mount counter lungs. Explore open seas, caves, or wrecks with ease.

Tested by ANSTI at 100 meters, the Prism 2 had the lowest work of breathing of any mixed gas CCR unit. Tanks and valves will need to be purchased separately.

Learn more about the Hollis Prism 2 here.

Weight	Unit weight of 47 pounds in standard configuration
Counter lungs	Split counter lungs
Counter lung config	Both front and back-mount counter lung configurations
Counter lung drain	Counter lung drains to easily remove water during a dive
Gas lines	All gas lines external to the breathing loop
ADV	Automatic diluent valve
Diluent valve	Manual diluent valve
Gas compatibility	Air, Trimix, and Heliox suitable
O2 valve	Manual oxygen valve for manual PPO2 adjustments
Harness	Harness and BC or backplate
Cylinders	Compatible with 2 and 3-liter cylinders
Display	LED display for an easy to monitor system status
PPO2 display	PPO2 displays for each sensor
Power switch	External power switch
O2 calibration	Push-button O2 calibration
Secondary display	Large secondary display
Gas switching	Supports diluent switching and multi-gas dive plans
Bailout	Two-button OC bailout
CNS tracking	CNS tracking for real-time oxygen exposure
Firmware	User updatable software
Stand	Stand included with purchase

Specs & Features