Junk - Aquarium Cooler - Zensui ZC-500E

I purchased this item used for ￥100,000 recently, but it struggles to accurately read the temperature, causing it to fluctuate between 24-30°C when the water temperature should be 25°C. The cooling function itself is operational.
Currently, there are times when the temperature calibration cannot be set below the displayed temperature. (This issue resolved after leaving the unit unplugged for about a week.)
The previous owner mentioned that they recently requested an overflow modification from Zensui.
The cooling capability has been confirmed.
While not tested, it is likely usable if you install a separate thermostat for temperature management.
Although it is a used item, there are no particularly noticeable scratches. However, as it is a used item, there is some expected dirt and grime.
For these reasons, I am listing this item as junk.
This item is intended for those who can repair it themselves, those who need parts, or those who want to cool their tank regardless of precise temperature control.