Additel ADT761ALLP [ADT761A-LLP-05-DP20] Automated Low / Differential Pressure Calibrator, 0.05% FS With DP30 and DP20 Sensors , -30 to 30 inH2O (-75 to 75 mbar) and -20 to 20 inH2O (-50 to 50 mbar) The Additel ADT761A-LLP-DP10 Automated Pressure Calibrator with DP30 and DP10 Sensors, -75 mbar to 75 mbar (30 inH2O to 30 inH2O) is completely self-contained and automated with a built-in pump for pressure generation and precision control technology. With removable internal pressure modules, increased speed to pressure, ability to read two external pressure modules, touch screen display, Wi-Fi, Bluetooth, and Ethernet communications, double the original battery life, and more - simply set the desired pressure and watch the calibrator do the work. The Additel ADT761A-LLP-DP20 is designed for low pressure calibration and comes with a ±30 inH2O (±75 mbar) high range module and a low range module, DP20  -20 to 20 inH2O (-50 to 50 mbar). This unit has an accuracy of 0.05%FS with control stability better than 0.005%FS. All measurements can be made in differential or gauge pressures.