Designed and assembled in Canada, the DB(BR)xxx series differential barometer/altimeter (patent pending) is a higher accuracy version of the EM(BR)xxx.  This product  integrates the DBOxxx module in a ruggedized unit with built-in power source and Bluetooth (rover only) capabilities. Optional GPS tracking is available in the DB(BR)Gxxx variants. 
 
The unit provides atmospheric pressures and derived elevations at a rover using corrections transmitted from a stationary base.   In traditional systems elevations are calculated based on pressure readings for a stand-alone unit and are subject to the errors inherent with environmental changes in pressure.  Some applications of this versatile engine include indoor elevations, building pressurization monitoring, multi-node telemetry networks and UAV altitude references.