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The following items are NOT suitable for ultrasonic cleaning:
Soft jewellery:
For example, pearls, emerald, ivory, coral,
agate, sea turtle shells.
Welded, plated, and glued items
Watches:
Except diver's watches with depth rating
over 50m.
Inlay studs and unfastened decorations
Others:
Wood, coated glass (for example,
prescription glasses), ceramic, camera, or
filters with pre-existing cracks.
Placing these items may result in scratches to
them if cleaned with this machine.
Ultrasonic cleaning may enlarge the gaps
inside the welded joints, plated coating, or
glue and may cause separation.
The strong penetration capability of the
ultrasonic waves may result in water entering
watches if they are not waterproof.
These items may shed and become
damaged during cleaning.
Ultrasonic cleaning may damage the
protective coating on these items or enlarge
pre-existing cracks.
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