* Multi-level fixed battery card slot for battery measurement of various specifications.
* measurable battery types: various button batteries, 5, 7, 9V square batteries, rechargeable batteries, etc.
* Function: It can be measured whether the battery is full or not. The color of the indication indicator is as follows.
Many electrical appliances have different requirements for starting the battery. Although many batteries cannot be used to drive A appliances, in fact, there are still a half of the power in the battery. It can be used in B appliances. The battery tester can detect the No. 5 and No. 7 batteries at any time, including the presence or absence of electricity, and the amount of power, thus completely avoiding wasting the battery.