Draft entry. Specs not yet verified against the manufacturer.

McLean

McLean Extreme

A boutique, hand-built technical computer machined from solid Delrin with a fully custom display.

Open BLE sync (libdivecomputer)

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

McLean Extreme
3.1Comparison Score
Released—
Max depth rating—
AlgorithmBühlmann ZH-L16 with gradient factors
Air integrationnone
Wirelessbluetooth
DisplayCustom TFT color display with fully configurable layout
Batteryuser-replaceable
Digital compassYes
Gas typesair, nitrox, trimix
Gas switches8
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
  • Machined from a solid block of Delrin with a 5mm Lexan window and gold-plated stainless fittings, built to last
  • Runs on a standard field-replaceable AA battery
  • Up to 8 configurable diluent or open-circuit gases, fully customizable display layout
Cons
  • Could not confirm a manufacturer max depth rating or current pricing, the manufacturer's site was unreachable during research and it isn't carried by major retailers
  • Boutique, hand-built computer with a small production run; some ScubaBoard users report build-quality and reliability issues
  • Niche brand with limited dive-shop availability outside Europe
Diver community sentiment
Mostly negative

On a three-page Scubaboard thread about the McLean Extreme 5, several posters report serious reliability problems, including a unit that failed after only four dives due to a defective pressure sensor, recurring underwater reboots traced to battery contact issues, and a separate account of cracked screens and water intrusion over nine months of ownership. Multiple users describe customer support as slow or unresponsive, including one report that a support request went unanswered for four weeks. Several experienced posters advise waiting for a longer track record before buying, or choosing a Shearwater Perdix instead. A few posts note it works well once initial defects are repaired, but praise is notably thinner than the complaints.

Scubaboard: McLean Extreme 5 discussionScubaboard: McLean Extreme 5, page 2Scubaboard: McLean Extreme 5, page 3

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

The McLean Extreme is a boutique technical computer built around a solid Delrin case and an ARM-based custom circuit board, popular in cave and CCR circles for its rugged construction and fully configurable display, though it’s a much smaller operation than mainstream dive-computer brands.