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Surface with barnacles removed
Thin layers of green algae over paint don’t generally need to be
removed.
When using Multiple Echo mode you DO NOT need to remove any
paint or surface protection – the gauge is designed to read
through and ignore these layers.
If there is loose rust (rusticles) or de-lamination of the metal
surface then you will probably need to remove these loose outer
layers with a scraping tool. Sometimes a chipping hammer is used
to remove stubborn rust layers.
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