The GCA-06 Digital Geiger Counters are NRC certification ready instruments. Useful for detecting and accurately measuring radioactivity. The GCA-06 Geiger counter has an internal LND 712 Geiger Mueller tube. Applications: Education – Classroom demonstrations and nuclear experiments; Emergency Services and Domestic Preparedness for nuclear accidents. Compliance Verification and Radiation Screening for wastes and other materials. The GCA-06 nuclear radiation detection Liquid Crystal Display provides an easy to read digital output. Switch selection allows GCA-06 Geiger Counter to measure and convert radiation (counts per second) into in mR/hr or mSv/hr. Time selection switch allows Counts Per Second (CPS) or Counts Per Minute (CPM) mode. All Geiger Counters are Factory calibrated using a NIST Traceable Calibration.to insure an accurate measurement. NRC certifications are available at additional costs through the manufacturer. Data Output: Either Serial Data (default) or TTL logic pulse for each radioactive particle detected. The serial output is the counts per second sent via USB cable (not included) to our Windows PC Geiger Counter Graphing program (not included) for charting and recording. Secondary indicators; audio (clicks) and visual (LED) included. Also includes a headphone jack and a power jack for external power. A 110VAC to 9V wall transformer external power supply is incl. 9V Battery for mobile operation is not included. Images SI Inc., is a U.S. company that manufactures and assembles in the United States.