There are two main limitations of the Geiger counter. However, they made many improvements, including the employment of a Geiger counter. Placed under a Geiger counter, it produces 10 counts per minute. The intended detection application of a Geiger counter dictates the tube design used. He also resumed Geiger counter measurements of radiation. This device was a prototype of a Geiger counter and was built in the 1930s. The officers also checked Gorman's P-51 Mustang with a Geiger counter for radiation. The group uses off-the-shelf Geiger counter equipment. A Geiger counter is a quick and rough approximation of activity. Libby's first detector was a Geiger counter of his own design. They had traced the cowl with their "super sensitive Geiger counter" in the Batplane. A Geiger counter is an instrument used for detecting and measuring ionizing radiation. A Geiger counter was used to observe absorption, movement and nutrient utilization. A simple Geiger counter is a contamination meter and not a dose rate meter.