These machines do not correspond to the description. You're not nulling the gap properly. It's better to buy a set of regular Wahl or Andis clippers and ask the barber not to cut them for you. They're not even made for a trimmer-height shave, let alone a clean line.
Trimmer Philips BT1216 Series 1000
52 Review
Wahl Lithium Ion Total Beard Trimmer with 13 Guide Combs for Effortless Grooming β Model 9888
33 Review
Roziahome Men'S Hair Clippers & Foil Shaver - Professional Barber Kit With Electric Razor - Cordless Rechargeable Beard Trimmer And Hair Cutting Machine (Transparent)
42 Review
Philips MG5730/15 Multi-Grooming π Set: 11-in-1 Versatility in Sleek Black
64 Review
Brown Velvet Wig Grip Band - Adjustable MainBasics Headband
33 Review
Adjustable Elastic Hair Band For Girls - Hairizone Cosmetics Headband For Shower, Spa, And Face Washing With Bowknot Design (Blue)
33 Review
Coolcos Synthetic Hair Headbands: 5 Strands Elastic Braided Style For Perfect Plaited Look
33 Review
Stylish And Practical Adjustable Cap For Women With Long Hair - Perfect For Work And Play!
40 Review