Which of the following is a common tool used in barbering?

Barber shears are essential tools in the barbering profession, widely recognized for their role in cutting and shaping hair. These specialized scissors have a unique design that allows barbers to achieve various cutting techniques, such as layering and texturizing, which are crucial for creating the desired hairstyle. Their sharp blades provide precise cuts, and they come in different sizes and styles to suit various hair types and cutting methods.

The other tools mentioned, while useful in their respective contexts, do not align with the typical requirements of a barber's toolkit. Microwaves are used for cooking, and floor buffers are involved in cleaning and maintaining flooring surfaces, which are not relevant in a barbering setting. A scalp massager may enhance relaxation for clients but is not as fundamental to the core services provided by barbers compared to barber shears. Thus, barber shears stand out as a primary instrument integral to the practice of barbering.