Some of these computers were recalled because of dangerous errors in the software and should NOT be used. (Just Google "Dacor Darwin recall").
This may or may not be one of those, but I'd strongly recommend that the OP check the computer's serial number per the instructions below and remove the listing if it is subject to the recall.
Here's the text from Dacor:
RECALL: Dacor Darwin Air & Darwin Console Dive Computers
If you have recently purchased a Dacor Darwin Air or Darwin Console Dive Computer, please read the following safety notice regarding the recall of certain computers.
HTM Sport S.p.A., Manufacturer of Dacor Dive Computers, has discovered that during production, a small number of Dacor Darwin Dive Computers were improperly calibrated, resulting in erroneous calculations displayed regarding "No Deco Time", "Deco Time", "Air Time", "Desat Time" and "No Fly" times.
The specific products that may have this defect are in the following groups:
Darwin Air Dive Computers Serial Numbers between: 3265 and 3415
Darwin Console Computers Serial Numbers between: 8503 and 8592
To locate the serial number of your Darwin Air or Darwin Console:
1. Find the watertight battery compartment cover located on the top of Darwin Air or the left side on the Darwin console.
2. Unscrew the watertight cover by turning 90° counter clockwise.
3. Remove the batteries and then put them back in, after a few seconds the serial number of the instrument will appear on the screen.
If you own one of the Darwin Computers with a serial number listed above, DO NOT USE IT!
Diving with an improperly calibrated dive computer will provide inaccurate No Decompression (no stop) Time, Decompression Time, Desaturation Time and No Fly Time, and could result in serious injury, including Decompression Sickness due to Omitted or Insufficient Decompression!
Immediately take your dive computer to your Authorized Dacor Dealer for repair. You should expect to receive it back from the dealer within 4-6 weeks.
We regret any inconvenience caused by this recall and thank you in advance for your cooperation.
Mares/Dacor Diving
