电池电压低于5V 时，电压量程按钮开关应打在5V档上。
When battery voltage is less than 5V, voltage range switch should be set to 5V.
为了获得最好的准确度，应当在测量工作所使用的量程上对仪器进行调零。
For optimum accuracy, zero the instrument on the range to be used for measurement.
通常，它只能检测到你机器上的少量程序并让你选择使用。
Usually, it detects and lets you choose only a few of the applications you may have on your machine.
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