| 1 | Lower than standard resistances are not recommended. | |
| 2 | For high resistance measurement, the lead resistance is negligible. | |
| 3 | The red and the voice prompts that circuit resistance is too high or too low. | |
| 4 | The output signals may be resistance signals( resistance value can be set by yourself) or voltage signals. | |
| 5 | If the heater circuit is working, it heats the sensing blub , thus changing the resistance of the bulb. |