Data on diagnostic and measuring equipment used in clinical laboratory tests are collocated in the manual. The handbook is designed for use by a broad range of men working in medical and related sciences. The compilation and systematic presentation of material is done on a level accessible not only to physicians, physiologists and biochemists but also to medical technicians handling the equipment. The nature of exposition varies accordingly from one chapter to another. Widely used equipment such as the simplest electrocardiographs is described in popular terms. The electroencephalograph, spectrophotometer and other highly specialized instruments are described briefly, since such equipment is handled by trained technicians with adequate knowledge of the relevant physical sciences.