Thereof, can I use a beard trimmer on my head?
Yup works fine, provided you have the guides for the length you want. Take it slow and make sure its fully charged! Generally they're not quite as beefy as proper hair trimmers to just take it slow and steady, should be fine.
Likewise, can I use same trimmer to remove pubic hair? Yes. You can use a beard trimmer for your pubic hair. In addition, it is generally accepted that a good old fashioned razor should be used for the scrotum (ball) hairs instead of a trimmer as it's less likely to cause these nicks and cuts.
Also to know is, what does a body groomer do?
Groomers are similar to hair clippers, but they are specifically designed to cut hair on the body. For men, groomers can be used to trim the hair on the chest, abdomen, armpits, or the groin area. Groomers usually have non-adjustable heads and use a single head to trim the hair.
Can a trimmer be used by two person?
The first is to refrain from sharing a beard trimmer in the first place. However, you still need to clean and disinfect it regularly, even if you are the only person using it. Otherwise, it is best not to share the beard trimmer at all.