Oceanic's VT3 dive computer can switch among up to three different Nitrox mixes containing 21-100% oxygen. The VT3 also sports over-sized digits, a nifty "Patented Air Time Remaining Algorithm," alarms that require user acknowledgment, a SmartGlo backlighting system, a 24-dive on-unit logbook, diver-replaceable batteries, and more. The VT3 also features an optional wireless transmitter, so a diver can monitor gas pressure from up to three independent cylinders. (This is clearly ideal for technical diving applications. However, it may also be useful for recreational divers using the Buddy Pressure Check feature.) The VT3 receiver runs $599. With the wireless air-integrated transmitter, the unit runs $999.