Direct ophthalmoscope is a hand-held instrument, which can be powered by battery or electricity, and is more convenient if portability is desired. It is used for the visual examination of the retina and ocular media. It uses the patient's eye as a simple magnifier by aligning its viewing and illuminating beams. This produces an erect magnified, well-detailed real image of the retina.

A dermatome is a surgical device that is used to produce thin slices of skin from a donor area, in order to use them for making skin grafts. Its main application is for reconstituting skin areas damaged by grade 3 burns or trauma. It can be operated either manually or electrically. Electrical dermatome is better for cutting out thinner and longer strips of skin with a more homogeneous thickness.

Dressing forceps are designed for general use in dressing wounds, removing fragments of necrosed tissue, and small foreign bodies. It has smooth or smoothly serrated tips. It consists of a slender form of pincette, terminating in a series of transversely serrated teeth.

Dialysis system reference meter is designed to measure the conductivity, pH, temperature & pressure of dialysate fluids from hemodialysis delivery systems, dialysate concentrates and water from water purification systems. It is used in clinic setting or calibration of hemodialysis delivery instrumentation.