General principles. Microdisplacement sensors. Industrial and surveying range length transducers. Automatic angle measurements. Tilt and alignment. Using transducers to measure and control position. History and technique of temperature measurement. Non-contact and lesser known methods of determining temperature. Measuring moisture. Flow. Force, weight and torque. Pollution monitors. Measurement difficulties, instrument information. New developments: microprocessors, optical fiber and microelectronic sensors.