1. Set the voltmeter to DC.
2. Select the correct voltage range (you need prior knowledge of the likely maximum voltage).
3. If the voltage source is grounded, apply the appropriate test probe to the grounded terminal and then apply the second test probe to the ungrounded terminal (this is a safety precaution).
4. Avoid causing a short circuit with the test probes.
5. Use test probes with approved tips and finger guards (this is another safety precaution).
6. See Bill's answer.
2. Select the correct voltage range (you need prior knowledge of the likely maximum voltage).
3. If the voltage source is grounded, apply the appropriate test probe to the grounded terminal and then apply the second test probe to the ungrounded terminal (this is a safety precaution).
4. Avoid causing a short circuit with the test probes.
5. Use test probes with approved tips and finger guards (this is another safety precaution).
6. See Bill's answer.
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Use a voltmeter
Don't touch high voltage
Don't touch high voltage