[Menu]>[Electronic circuit engineering introduction]>[Basic knowledge of Engineering Instrument]
The electronic circuit is small size. Therefore, the short circuit, loose soldering of the circuit need to be confirmed after soldering.
Although even the naked eye is able to confirm, the one which confirmed with a magnifying glass is able to confirm certainly.
The big one is easy to confirm.
This is the magnifying glass that attaches and uses it to the head like a hat.
Because it is possible to use both hands, it is convenient to confirm the small making and so on.