Most beard trimmers come with guards, but if yours does not, you can buy one separately. To use the guard, simply attach it to the trimmer and then select the desired length setting. The guard will prevent the blades from cutting too close to your skin.
Guards come in 1 to 25 millimeters. They are supposed to gather hair towards the blade and help it buzz cleanly. You can use an electric razor without a guard.
Do You Need A Guard On A Beard Trimmer?
The guard should be removed for shorter styles. This will leave you with stubble. After you shave with a straight razor, you can clean up any problem areas. To keep your mustache and mouth free of hair, use a trimmer without a guard. 
Can You Use An Electric Trimmer Without Guard?
Guards come in 1 to 25 millimeters. They are supposed to gather hair towards the blade and help it buzz cleanly. You can use an electric razor without a guard. 
What Setting Should I Use On My Beard Trimmer?
Bringing your beard down gradually is the best way to trim it. To trim your beard all over, set your beard trimmer to its longest setting. Excess bulk can be removed by going against the direction of hair growth. When you’re happy with the length, use shorter trim settings. 
What Grade Should I Trim My Beard?
Long lustrous beards may need to be trimmed with a longer grade 8 (25mm) if you want to maintain short stubble. 
What Are The Numbers On A Beard Trimmer?
Guards go 0-8 depending on the brand. The lower the guard number the shorter the hair is, a lot of the lower numbers are used in fades, so if you request a fade you’ll have extra brownie points for knowing what number you’d like to fade from and into. 
What Guard Is Best For Perfect Stubble?
The ideal stubble length is 3mm, though lighter-colored facial hair may need to be left to grow a little longer to be noticed. 
Frank Harmenstein is the lead editor of the grooming website Cut Throat Straight Razor, and has over 15 years of experience in the industry. He’s personally tested and reviewed over 200 different straight razors, and has written countless articles on the subject.