Additel ADT761ALLP [ADT761A-LLP-20-DP025] Automated Low / Differential Pressure Calibrator, 0.2% FS With DP30 and DP025 Sensors , -30 to 30 inH2O (-75 to 75 mbar) and -0.25 to 0.25 inH2O (-0.62 to 0.62 mbar). The Additel ADT761A-LLP-DP025 Automated Pressure Calibrator with DP30 and DP025 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-DP025 is designed for low pressure calibration and comes with a ±30 inH2O (±75 mbar) high range module and a low range module, DP025. 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.