GMP-25TD is a training probe which connects to the RDS-31TD training meter and simulates the features and functions of the GMP-25 external pancake probe. It provides realistic response based on source/detector geometry using SIM-Teq RFID contamination sources or responds to TWR Source or control manually with SCC. Uses standard probe cable, included.

Train Your Radworkers To:

  • Use proper frisking speed and probe-to- surface distance
  • Observe elevated contamination levels on the meter
  • Hear audible click rate as radiation levels change
  • Assess if contamination has spread by using multiple contamination sources placed throughout an area
  • Recognize elevated background interference and effects on performance when used with SIM-Teq TWR “live” source


  • Simulates features and functions of the Mirion GMP-25 External Pancake Probe when connected to SIM-Teq RDS-31TD
  • Realistic response based on source/detector geometry
  • Detects simulated α, β, or α+β Contamination Sources
  • Demonstrates saturation when detector response is > 50,000 cps
  • Use with any SIM-Teq RFID contamination source(s) OR respond to TWR source or control manually with SCC application
  • Built with real GMP-25 hardware


  • Power – One (1) Internal rechargeable 2000mAh 3.7V Lithium-ion Polymer battery
  • Battery Life – >8 Hours
  • Environmental – Drop and Water Resistant
  • Wireless Communication – ISO/IEC 15.693, 13.56 MHz, ≤1.4 W
  • Dimensions – 37.5 x 70 (14.8 x 2.75 in.)

Additional Features:

  • Probe connects directly to any RDS-31TD training meter using a standard probe cable (auto-response of internal simulated GM detector retained)
  • Operates independently with any SIM-Teq Contamination Sources, OR manually controlled by an instructor
  • Range of operation is up to 4 inches (100 mm) from a surface location of Contamination Source
  • Response performance characterized from real instrument
  • USB-C charging port
  • LED Battery level and charge indication