Additel ADT681-20 [ADT681-20-AP50-PSI-N-DL] Digital Pressure Gauge With Data Logging, Absolute Pressure, 0.2% FS, 1/4 NPT Male, 0 to 50 psi (0 to 3.5 bar). The Additel ADT 681 digital pressure gauge is equipped with advanced microprocessor technology and state-of-the-art silicon pressure sensors. To achieve fully temperature compensated accuracy every sensor is pressure tested at several environmental temperatures from 14° to 122°F. With this test data individual coefficients are generated and stored in the gauge characterizing its performance over the full temperature compensated range. Data logging is available on the standard gauge pressure, absolute, compound, differential, panel mount, and intrinsically safe versions. The ADT681 series digital pressure gauges provide an accurate, reliable, and economic solution for a wide range of pressure applications such as precision pressure measurement, field gauge calibration, pressure safety valve testing, pressure regulator testing.