Draft entry. Specs not yet verified against the manufacturer.

Heinrichs Weikamp

Heinrichs Weikamp OSTC 2 TR

The OSTC 2 with wireless transmitter support for air integration.

Open BLE sync (libdivecomputer)

Syncs wirelessly with third-party apps (Subsurface, Currents, etc.), not just the manufacturer app.

Heinrichs Weikamp OSTC 2 TR
4.1Comparison Score
Released2018
Max depth rating120m
AlgorithmBühlmann ZHL-16C with optional gradient factors
Air integrationwireless
Wirelessbluetooth
DisplayFull-color LCD IPS-TFT
Batteryrechargeable
Digital compassYes
Gas typesair, nitrox, trimix
Gas switches6
CCR capableYes

"Gas switches" is how many different mixes this computer can be programmed to switch between mid-dive, mostly relevant for technical/staged-decompression diving. It doesn't tell you which gas types (air, nitrox, trimix) are supported. See Gas types and the product description above for that.

Pros
  • Adds gas-integration transmitter support on top of the standard OSTC 2 feature set
  • Up to 60 hours of runtime in dive mode
  • Open-source firmware and Bluetooth data transfer
Cons
  • Could not confirm current pricing, the "TR" listing no longer appears as a separate SKU on Heinrichs Weikamp's current storefront (hwdiving.com), which now sells the OSTC 2 as a single model with a firmware choice
  • Niche brand with a smaller dive-shop support network than the majors
  • No built-in digital compass
Diver community sentiment
Mixed opinions

Divers on Scubaboard generally praise the OSTC line's highly customizable, open-source-derived interface, calling it better organized than Shearwater's Petrel, along with Bluetooth wireless configuration and exceptional, often free, customer service directly from Heinrichs Weikamp in Germany even outside warranty. The OSTC 2 TR specifically draws criticism for its proprietary wireless transmitter: divers comparing it to the Shearwater Perdix AI noted the OSTC TR is cheaper but the transmitter is hard to source and not interchangeable with more established PPS transmitters, which pushed at least one buyer toward the Perdix AI instead. Separate reliability complaints surface in general OSTC feedback threads, including a depth-sensor failure and one diver reporting five failures across two other OSTC models.

Scubaboard: OSTC TR vs Perdix AI transmitter comparisonScubaboard: OSTC feedback and reliability threadScubaboard: general OSTC discussion

Summarized from public forum discussion (Scubaboard, Reddit, and similar), not a survey we ran ourselves. See the linked threads for the original conversations.

The OSTC 2 TR is the transmitter-ready variant of the OSTC 2, adding wireless gas integration to the same open-source, 6-gas trimix platform. Product photo shown is the base OSTC 2 housing, which the TR variant shares. Note: the manufacturer’s current online store no longer lists “OSTC 2 TR” as a distinct purchasable product. It’s unclear whether the TR variant has been discontinued, folded into the base OSTC 2’s feature set, or simply moved to a different sales channel.