✓ Authorized Shearwater Dealer · Full 2-Year Warranty · We dive what we sell Petrel 3 Monitor (4-Pin) ⭐ Over 250 verified reviews · Trusted by recreational and technical divers A Petrel 3 dive computer and rebreather monitor for 4-pin (analog) closed-circuit rebreathers. 4-Pin Analog Monitor For compatible closed-circuit rebreathers. Premium AMOLED 2.6' display, toughened glass, titanium bezel. Cable Length Options 18' or 30' to suit your loop. Full Technical Suite Trimix, CC/BO, air integration. "We dive Shearwater ourselves, we set your computer up before it leaves the shop, and we're a real phone call away after. That's the OTA difference." — The team at OTA Scuba & Swim, Katy TX 💡 Questions before you buy? Ships new with the full Shearwater 2-year warranty and free US shipping over $99. Call or text us at 855-OTA-DIVE (855-682-3483) — we dive this stuff and we'll give you a straight answer.