Hardwood case with a leather handle and metal hinges and clasp; aluminium interior instrument panel has black finish; instructions on paper are inside the lid; the instrument panel features four black plastic knobs, two metal switches, a glass window surrounded by black metal, a plastic covered dial indicator, two red circular pieces, and three binding posts with black plastic covers; a black power cord with grounding lead extends from the top of the instrument; there are two instructional tags attached to the power cords.

The Sunderman Conductivity Bridge, often used in conjunction with a conductivity cell and a water bath, measures the electromagnetic conductivity of small quantities of biological fluids. It is specifically designed to determine a sample serum's total base and to estimate its serum sodium, which has important clinical implications. Tests can be made using only 0.5 ml of sample.