Hollis Prism 2 CCR Rebreather Review

Torben Lonne
By
Torben Lonne
ByTorben Lonne
Editor and Co-founder at DIVEIN.com
Torben traveled to South East Asia for scuba diving and never really stopped his search for new adventures. His affinity for gear that works and his...
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- Editor and Co-founder at DIVEIN.com
Hollis Prism 2 rebreather with red and black wing, coiled hoses, gauges and twin cylinders

Where to buy

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.

About this review

To help you find a Rebreather that will fit your needs, we’ve tested, researched, and reviewed the best ones available today.
We test both in the water, diving in various conditions - and in our lab - so we can give you accurate answers on quality, performance, and the overall value.

Read about our test of Rebreathers

Recommended in: Rebreather

Disclosure: We are reader supported, and may earn affiliate commissions when you buy through us.

Things we like:

  • Highly customizable, plenty of different options for add-ons, configurations, and dive styles
  • Rear-mounted radial scrubber
  • Excellent work of breathing
  • CE approved
  • Hollis has an excellent reputation for after-sales support

Things we don't like:

  • One of the finickiest scrubbers to pack in the industry
  • BOV is sensitive to freeflow on the surface

Specs & Features

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
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