Batterij testerMulti level fixed battery card slot for battery measurement of various specifications. FEATURES: Measurable battery types: various button batteries, 5, 7, 9V square batteries, etc. Function: It can measure whether the battery is full or not. The color of the indication indicator is as follows. Red (RE PLACE replacement or RE CHARGE charging): If the indicator pin points to this block, the battery under test needs to be replaced or recharged, that is,