Checklist: pressure test and waterproofness after service
Test the tightness, don't guess
Use this checklist each time you have opened a watch case — whether for battery replacement, cleaning or other service — and the watch needs to be water-tight again.
§Before you open the watch
- 01Note the watch's original water-resistance marking (e.g. 30 m, 50 m or 100 m)
- 02Tell the customer that opening the watch requires a subsequent test of tightness
- 03Examine the crown type—pulled crown or screw crown—before you start.
§During assembly
- 01Replace seals and o-rings if they are hardened cracked or visibly worn.
- 02Clean all sealing surfaces for dust, hair and grease
- 03Lubricate rubber rings with the right grease where applicable
- 04Clamp the screw cap and bottom correctly so the gaskets are pressed together evenly
§Pressure testing
| Step | Checked |
|---|---|
| 1 | Marked water resistance noted before work begins |
| 2 | Seals and gasket rings inspected and replaced for wear |
| 3 | Sealing surfaces cleaned of dust and hair |
| 4 | Screw crown/bottom tightened correctly |
| 5 | Dry test conducted at marked pressure |
| 6 | Result recorded and communicated to the customer |
A fixed routine for pressure testing protects the customer's watch against moisture damage — and protects you against a complaint that could have been avoided with five minutes of extra work.