What skin analysis tool can be useful for assessing a client's skin type and condition?

The magnifying lamp is a crucial tool in skin analysis as it allows the therapist to closely examine the client's skin type and condition. By using a magnifying lamp, the therapist can observe details that are not visible to the naked eye, such as the texture of the skin, pores, and any potential concerns like blemishes or sensitivity. This close examination helps in determining the appropriate treatment and products tailored to the client's specific skin needs.

In contrast, the other options do not serve the purpose of analyzing skin. A hot towel is primarily used to warm and relax the skin or soften it for treatment, but it does not provide insights into skin type. An electric drill is typically used for nail care and enhancements, and does not relate to skin analysis in any way. A nail buffer is used to polish and shine nails but does not contribute to understanding skin conditions or types. Therefore, the magnifying lamp stands out as the essential tool for effective skin assessment in beauty therapy.