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So, beside the calibration part, I can put the HUD in my pocket as you say, and use the electronic unit with the OSTC3 to get there all the relevant information there (PO2/voltage). In that case I can decide to use the HUD on some dives, and leave it above water on other dives. I suppose, if I see ...

Matthias, thanks for your answer, but I do not understand. Are you saying that the read out of the o2 sensors can only been shown on the HUD, in the form of LEDs? Or can I use the battery and electronic part of hte hwHUD to connect to a OSTC by optical link?
Greetings, Ronald

Thanks.
I'd like to make a connection between my 3 o2-sensors and the OSTC unit. What are the possibilities?
Greetings, Ronald Vreijsen

I read that there is a "wet" connection in the OSTC3. Does this mean you can disconnect the O2-cable under water (and f.i. connect it with a backup unit)?
Thanks,
Ronald