These Digital Manometer are available in various specifications ranging from -5 to +5 PSI, -15 to +15 PSI & -30 to +30 PSI, it is used to calibrate the low pressure and differential pressure instruments. It has larger dual LCD with back light with USB computer interface. It shows low battery indication and has zero adjust, offset and DIF function. Tested on various quality parameters, it is loaded with advanced software program for all windows.