- An ohmmeter consists of a battery in series with a meter; a variable resistor is used to set zero when the probes are shorted together; digital meters have auto-zeroing
- Analogue ohmmeter scale is non-linear – high values are cramped together at the beginning of the scale
- As voltage is applied by the meter, measurement should not be made in live circuits
- When checking sensitive semiconductor devices care should be exercised not to exceed voltage limits