Proud Distributors of GUNT Hamburg, UTEST, FOUR E’s Scientific & LABTECH ITALY



SKU LMH335 Category

With adjustable alert level alarm

Code LMH335
Tariff 902480 90
  • The hand-held unit measures alpha, beta, gamma, and x-rays. Its digital display shows readings in your choice of counts per minute (CPM), CPS, μSv/hr, mR/hr, or in accumulated counts.
  • With USB and the included Observer USB Software, you can download your accumulated data from the internal memory, set alarms, and calibrate your instrument!
  • It uses a Halogen-quenched GM tube with thin mica end window detector.
  • The mica window density is: 1.5-2.0 mg/cm2. Effective window diameter is .360 inch. Side wall is .012 inch thick.

Operating Range:

mR/hr – .001 (1μR) to 200 mR/hr

μSv/hr – .01 to 2000

CPM – 0 to 214,000

CPS – 0 to 3575

Total/ Timer – 1 to 9,999,000 counts


±10% typical (NIST), Typically ±15% of reading.

Energy Sensitivity

  • 1070 CPM/mR/hr referenced to Cs137
  • Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is greater than 80%.
  • Detects beta at 50 keV with typical 35% detection efficiency.
  • Detects beta at 150 keV with typical 75% detection efficiency.
  • Detects gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the case.

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.