Data recording equipment are test instruments and devices that precisely measure and record atmospheric and electrical information to help ensure optimum conditions for equipment, shipments, and facilities. Chartless digital recorders, electrical properties data loggers, and nonelectrical properties data loggers are paperless devices that continually record variables—such as voltage, water, oil pressure, temperature, and humidity—and display them on an LCD screen. Circular chart recorders use pens to record temperature and humidity data on rotating, round paper charts over a specified time period, providing an at-a-glance history of the conditions. Strip chart temperature recorders use pens to log temperature variations on a long strip of paper that is ejected out of the recorder, and are typically used to monitor conditions of products during shipment. Recorder and data logger accessories such as software and adapters enhance the performance of data recording equipment.