The iMet-1500C is InterMet's field-proven theodolite for synoptic and mobile operations:  Time tested design with high reliability and low operating costs  Uses low cost RDF or the latest generation 1680 MHz GPS radiosondes for maximum operating flexibility and cost-effectiveness All-digital architecture with a newly designed receiver and solid-state scanner Extensive Built-in-Test capabilities for fault isolation and maintenance  Windows-based iMetOS operating system is quick to learn and easy to use  Interoperable design allows for the use of radiosondes from mutiple manufacturers