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Please note: This product has a lead time of 7 days




The new high-end dive computer from Heinrichs Weikamp sets new standards in technical diving computers combining trimix and rebreather functions with ZH-L16+GF and VPM-B calculated simultaneously in real time.  It features the fabulous screens we expect from an OSTC computers by having a widescreen with 800 x 480 pixel resolution with brilliant colours on a crystal clear display readable in poor visibility or in bright sunlight.  Despite the high display performance, the battery life of the OSTC 4 operates for 40 hours in dive mode and more than two years in stand-by mode.

A 32Bit dual core processor offers enough processing power to simultaneously calculate two deco models in real time enabling switching from Bühlmann ZH-L16+GF to VPM-B whilst diving.

The housing is milled from a single block of aluminium and hard-anodized and fitted with an impact-proof glass panel and three integrated sensor buttons.

Developed and produced entirely in Germany, the OSTC 4 is backed by years of experience and continuous product improvements.  Like all OSTC computers before it there are free firmware updates, an interactive user forum, rapid service and competent support.

Standard features include:

  • Real time  switching from Bühlmann ZH-L16+GF to VPM-B
  • Constant PPO2 deco calculations for CCR via the hwHUD or ppo2 monitor
  • Wet optical interface for 3 cell PP02 display
  • 200m operating depth
  • Rechargeable Li-ion induction battery
  • Up to 40 hours dive time on a single charge
  • Integrated 3D compass (fully tilt compensated)
  • Bluetooth Smart (2.0/4.0)
  • Screen 3.2"(79 mm)800x480 pixels on IPS-LCD
  • Aluminium body
  • Three integrated hover buttons
  • Dimensions 87mm x 86mm x 23mm
  • Weight 290 g
  • Integrated bungee mount
  • Alternatively there is a bungee wristband available.


  • Manufactured by: Heinrichsweikamp

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