Product advantages: No power supply, can quickly judge 1.5V, whether the 9V battery power is enough, small and convenient to carry Product Features: Battery measurement of 1.5V5, No. 7, 9V square battery, can measure whether the battery power is sufficient, the pointer directly displays the measurement result Head color instructions are the following: Red (reset): If the indicator refers to this block, the battery in the test needs to be replaced or recharged, i.e. the battery is essentially not available. Yellow (low): The battery is very small, but some electrical appliances can be used. Green: The battery electricity is sufficient. Instructions: The 1.9V battery is directly connected to the two test holes on the side of the tester, pay attention to the positive and negative pole 2.1.5V5, battery No. 7, please open the test arm at the top of the tester with the handle to enter the battery board. Pay attention to the positive and negative pole. Product weight: about 34g Standard configuration: bare table (no battery) Color: black Delivery quantity: 1 piece