I heard that electric scale removers are difficult to use continuously because the handle gets hot from the heat from the motor, and that they will break down if they are wet and used continuously…

The motor of Electric Fish Scaler AST-150 is built into the main unit, not the handle, so the handle does not get hot.
Even if the handle gets wet, it will not cause the motor failure.
After use, please remove the flexible shaft from the main body, and hang it up to drain water.
This is to prevent a internal wire inside the flexible shaft from rusting and breaking.

■Product details
Electric Fish Scaler AST-150
https://asahi-packaging.com/products/tascale/