Along with this, there are also measuring instruments designed to control electrical and electronic elements.
Naturally, these devices lack the ability to measure engine speed and ignition timing. The advantage of such meters is the ability to measure both very small and very large resistances. Voltages can be measured in a very wide range and with high accuracy.
If the test is carried out to determine only the presence of voltage in the electric circuit, it is sufficient to have a regular test lamp (A). This method is applicable only to circuits that do not have electronic elements, since electronic control devices are extremely sensitive to high currents. When connecting a test lamp to them, electronic devices may fail. For cars, a special high-resistance voltmeter (B) is required. It performs almost the same functions as a test lamp, but does not damage electronic devices.