These guys are in Denmark, and their response time is about 4 days. I do AFF, Video and 4way. For the first 2 I cannot afford an instrument mal. I have been on an AFF where the other instructors visual altimeter failed (another popular brand). I can set custom warning levels depending on what kind of dive I am doing. a great feature. It's a great product, just ordered an optima.
Pro-Track
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in Altimeters