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Watch Pressure Tester - Can Test 1 or 2 Watches up to 6atm / Approx 200ft or 60m

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Product Details

Specialist Watch Case Pressure Tester (SKU: WCPT-6ATM)

Ensure the water resistance of your watches with this specialist watch case pressure tester. Designed to test the seals and casing of watches, it is an affordable option for verifying water resistance up to 6 ATM. While some watches are rated for higher pressures, testers exceeding this rating can be significantly more expensive. Based on our experience, this tester is effective for determining the water-tightness of the vast majority of watches.


  1. Leak Detection: Ideal for determining if a leak is due to user error, such as failing to screw down the crown, or a genuine failure of the watch.
  2. Collector Use: Perfect for collectors of older dive watches or water-resistant models who wish to test them before snorkeling or swimming.


  • Transparent Cylinder: Allows you to observe which part of the watch is not waterproof, indicated by the appearance of small bubbles.
  • Accurate Detection: Helps identify routine seal failures and pinpoint the exact location of the problem.


  • Capacity: 1 or 2 watches can be tested simultaneously.
  • Material: Aluminium.
  • Maximum Test Height: 72 mm.
  • Maximum Test Width: 65 mm.
  • External Pressure Interface: 6 N.
  • Pressure Test Range: 0.3 - 6 bar.
  • Cylinder Maximum Pressure: 10 bar.
  • Cylinder External Diameter: 80 mm.
  • Cylinder Internal Diameter: 65 mm.
  • Cylinder Height: 140 mm.
  • Weight: 3.4 kg.
  • Dimensions: 240 mm x 145 mm x 275 mm.

How to Use the Pressure Tester:

  1. Prepare the Cylinder: Fill the cylinder with distilled water up to the indicated level to avoid lime deposits.
  2. Place the Watch: Attach the watch(es) to the internal hook.
  3. Secure the Lid: Replace the lid and screw it down tightly using the two tensioning nuts on the top.
  4. Increase Pressure: Use the lever to raise the pressure to 3 atmospheres (as per the Swiss watch industry standard), then wait for 3 minutes to allow air to enter the watch. Increase the pressure by cranking the handle a few more times if necessary.
  5. Immerse and Observe: Immerse the watch into the water and immediately release the air pressure by pressing the knob. Watch for small air bubbles escaping from the case, indicating a seal failure. If bubbles are observed, lift the watch out of the water and address the issue, such as replacing the seal.

Preparation Before Testing:

  • Inspect for Obvious Issues: Check for chipped crystals, faulty crowns, cracked cases, or loose backs.
  • Check for Water Damage: Look for signs of previous water damage, indicating a problem.
  • Change the Battery: If testing a battery-operated watch, replace the battery prior to testing to avoid repeated tests.

This pressure tester is a valuable tool for both professional watchmakers and watch enthusiasts, ensuring the reliability and water resistance of their timepieces.

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