The rl2000 wireless system for pharmaceutical and biotech validation and monitoring applications is designed for applications where hardwired systems are not practical or cost effective, such as warehouses, environmental chambers, clean rooms and laboratories. The system is comprised of portable hand-held transmitters and PC-interfacing receivers. The rl2000 transmitters measure temperature and/or relative humidity with improved accuracies and resolutions, and can be mounted in temporary or permanent settings and require infrequent manual interaction. The rl2000 receiver and RadioLog software provide a graphical interface for record keeping, customized reporting and data archival features, with 21 CFR Part 11 compliant software available. The rl2000 enables "live" viewing of data, trends and alarms during validation and environmental monitoring.