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After its redesign the OSTC 2 has become thinner and handier. The anatomically shaped housing fits snugly to the arm and doesn`t bother you while putting on or off your dive gear. Nevertheless, enough space remains for the generously measured display and the long-lasting rechargeable battery that offers up to 60 hours of runtime.

Recharging works wireless and inductive. For recharging just put the dive computer on the delivered charging pad – that´s it.

The OSTC 2 can be operated both with the firmware hwOS sport edition for sport divers and the firmware hwOS tech edition for technical divers (additional costs*) The tech edition covers all ranges of technical diving including trimix and rebreather diving. The sport edition supports nitroxdiving with three gases and is a reliable companion even for challenging dives. Both fimwares offer a wide range of configuration options and additional functions such as an apnea mode or a digital compass.

The OSTC 2 is easy to use and has a intuitive menu guidance. Two integrated piezo buttons faciliate the handling with thick gloves or ring systems . Developed and produced entirely in Germany, the OSTC 2 is backed by years of experience and continuous improvements. Last but not least, it comes with free firmware updates, an interactive user forum, rapid service and competent support.

Scop of delivery Scop of delivery: OSTC 2 dive computer, firmware by heinrichs weikamp hwOS sport, charging pad, bungee, robust neoprene box, screen protector (already installed), colour: darkgrey

*If you want to upgrade to hwOS Tech: Please send the serial number to
After successful payment you get a firmware update, which you can install (only) on the device in question.

Technical Specifications:

Firmware hwOS sport: 3 gases, Nitrox up to 100 %, Bühlmann ZH-L16C + GF (or levels of conservatism)
(Firmware hwOS tech: 5 gases, Trimix, CCR (fixed SP), Bühlmann ZH-L16C +GF)

Processor Low power microchip PIC18F87K22

Data storage 4 MegaByte Flash

Display High resolution IPS LCD monitor, optically bonded to the front glass. Field of view: 160°. Resolution: 320 x 240 pixel. Size: 2,4” (61 mm screen diagonal)

Connector Bluetooth Smart Ready (2.0 und 4.0)

Sensor Intersema MS5541C. Temperature: resolution 0.1 °C / ± 1 °C. 3D compass (fully tilt-compensated), ambient light sensor

Battery Rechargeable lithium ion battery. Up to 60 hours of operation, standby 2 years

Controls Two piezo buttons

Housing High resistant ABS housing, scratch resistant borosilicate glass panel

Dimensions 76 mm x 78 mm x 30 mm

Weight 170 gramm

Maximum diving depth 120 meters

PC Software DivingLog, Mac-Dive, Subsurface, OSTC-Planner, DiveMate and many others

Scop of delivery Scop of delivery OSTC 2 dive computer, firmware by heinrichs weikamp, charging pad, bungee, robust neoprene box, screen protector (already installed)

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