Ohmmeters work by passing a small current through the component and measuring the voltage produced. If you try this with the component connected into a circuit with a power supply, the most likely result is that the meter will be damaged. Most multimeters have a fuse to help protect against misuse.
Lice itself is a Plural form and the the Singular of it is Louse. Louse ( Insect ) Louse is the common name for members of the order Phthiraptera, which contains nearly 5,000 species of wingless insect. : Wikipedia.
Lice are small, wingless, greyish-white insects with flattened, elongate bodies with oval heads. They are about 1/16 to 1/8 inch long. Here's a little video so you know what to look for (no need to click the link at the end, as it just takes you to watch the same video on YouTube)