It is extremely difficult to remove the button battery to replace the button battery.
It is impossible to measure with the display of 8888 although it is almost not used.
When asked to the manufacturer it was said that moisture could have entered. Waterproofing is insufficient to be immersed in liquid.
It has been said that it is impossible to repair as it has been over a year. Is it a consumable item to make 10,000 yen