Research guide
Used Dive Computer Inspection Checklist Before You Hand Over Money
A used computer can cost less, but its value depends on service history, display condition and actual manufacturer support.
Start with identity
Record the exact manufacturer, model and version. Verify manuals and update availability. Be wary of listings with generic family names, missing rear labels or a description copied from a different hardware revision.
Inspect wear systematically
Look for condensation, cracked glass, damaged charge contacts, nonfunctional buttons and corrosion on battery compartments. Ask whether a pressure test or service has been performed and request documentation when available.
Treat the battery as part of the deal
Confirm whether the battery is replaceable by the user, requires service or has a manufacturer-recommended replacement interval. Price the real charger and any service work, not just the used purchase.
Keep the return option
Buying a life-support-adjacent electronic device with no way to check function or return it is risky. Have it assessed according to the manufacturer instructions, and never assume an older computer can replace current training or dive planning.
How to use this guide
Save the questions that apply to your decision and check them against current primary documentation before spending money or booking travel. A clear written answer beats an attractive headline.
The specific product manual and appropriate training take precedence.