• Measurement of the dose rate 
  • Monitoring radiation exposure and ensuring an acceptable limit value
  • Display of immediate changes in the gamma radiation field


  • Adjustable proportional mode and ionization chamber mode 
  • Special radioactive control device for performance control of the probe
  • Comparison between measured value and reference value with deviation information


  • Measurement in continuous or pulsed gamma fields
  • Equivalent doses and dose rates          H*(10) in an energy range from          15 keV to 6.7 MeV
  • Accurate determination of the received dose

Product Overview

Technical Data

LB 135 TOL/G Ident no. 72320
TypeH*(10) gamma dose rate monitor
Energy range15 keV to 6700 keV
Dose rangeLDR: 10 nSv to 10 mSv HDR: 50 µSv to 10 Sv up to 9999 s
Dose rate rangeLDR: 0.1 µSv/h to 10 mSv/h HDR: 1 mSv/h to 10 Sv/h
Life span of the counting tube500 mSv in low-dose mode
Auxiliary voltage Power consumption4.75 to 5.25 V 80 to 120 mA
Ambient temperature in operation

-20°C to +40°

Storage ambient temperature-20°C to +50°C
Rel. humidity (Probe)10% to 90% (non-condensing)
Rel. humidity (Display unit)10% to 85% (non-condensing)
Protection class (Probe)IP 53
Protection class (Display unit)IP 43 (according to DIN IEC 60529)
Weight (Probe)ca. 300 g
Weight (Display unit)ca. 800 g (incl. batteries)
Data storage2400 recordings with date and time
Dimensions160 x 160 x 55 (L x H x D in mm)
CommunicationUSB (1 host for USB stick), RS-485 (for detector)
AlertsAcoustical and/or visual
WarningsDetector failure, temperature, warning threshold and measuring range threshold exceedance
Operating voltage6 VDC ±5%
Battery supply4 batteries rechargeable via mains unit
Radioactive control deviceIdent no. 72270
Activity2,5 kBq
Tolerance+0%, -30%