Compared with many of today’s household devices, hair clippers are decidedly low-tech. They typically run from size 1 (which translates to ⅛ of an inch of hair) in ⅛-inch increments up to size 8 (which translates to 1 inch). However, some companies offer sub-increments in between and may even have clips that allow for hair longer than an inch. Using a size-1 comb, for example, leaves ⅛ inch of hair on your head.) But our experts agreed that for most home users, even a low-end blade will dutifully cut hair for years or even decades.