For motorists who independently carry out repair work, there are combined measuring instruments specially designed for making control measurements on cars. Using such a device, you can measure engine speed, the angle of the closed state of the contacts of the ignition system interrupter, as well as voltage up to 20 V. Such a device, as a rule, can measure resistance in the range up to one kiloohm, i.e. from 1 to 1000 Ohm.
In addition, instruments for checking electrical and electronic parts are available. They allow you to measure both small resistances of a few ohms, and large ones, in the megaohm range (mΩ). These devices can measure voltages (in volts) with very high accuracy, which is especially necessary when checking electronic components.
If you just need to make sure that there is any voltage in the circuit at all, then a conventional tester with a control diode bulb is suitable in this case. This applies, of course, only to circuits that do not contain electronic components, since electronic devices are extremely sensitive to too high currents. Sometimes electronic components are damaged already at the moment of connecting such a control light.
Attention! For checking voltages in circuits containing electronic parts (transistors, diodes, relays) a high-resistance V voltage tester is required. It performs almost the same task as a test light, but does not damage electronic circuits and is suitable for any test.