Additel ADT 680W [ADT680W-25-V15-PSI-N] Digital Pressure Gauge With Wireless and  Datalogging, 0.25% FS, 1/4 NPT Male, -15 to 0 psi. Additel 680W digital pressure gauges use an advanced technology microprocessor and are aged, tested, and screened before assembly. With data logging and wireless capabilities, these gauges allow you to monitor and log pressure for real-time monitoring and logging to a PC wirelessly. Gauge can store up to 140,000 readings of pressure, temperature, and time. Supplied software allows reviewing of data after logging period is ended. Read as many gauges as you'd like on one PC by setting the same channel (1 to 15) on the gauge as the PCs' software, or read various gauges on different PCs by synching the channels to match PC and gauge. Optional software (order separately) shows current data being logged in real time on your PC and allows graphical analysis.