Ludlum Model 19 MicroR/Ratemeter

Ludlum Model 19 MicroR/Ratemeter

Pine Item #51518

The Model 19 is a highly sensitive gamma R/meter employing an internally housed, 2.5 cm diameter by 2.5 cm   thick (1.0 x 1.0 in.) NaI detector. The measuring range is 0-50 v/h   (0-5000 R/hr).   The cast aluminum instrument housing with its separate battery compartment and accompanying metal handle offer an industrial robustness and quality that promote long lasting protection and instrument life.

The front-panel controls include a rotary switch for selecting the five-decade range and instrument shut-off, an audio on/off switch, a fast/slow response switch, and pushbuttons for activating the meter lamp, high-voltage display, battery test, and count reset.  

  • Rotary knob selector: 0-25, 0-50, 0-250, 0-500, 0-5000 r/hr,   instrument off
  • Response: toggle switch for fast (4 seconds) or slow (22 seconds) from 10% to 90% of final reading
  • Audio: built-in unimorph speaker with on/off switch (greater than 60 db at 0.6 meters [2 ft])
  • High voltage: pushbutton to display hv setting on meter
  • Battery: pushbutton checks battery voltage
  • Reset: pushbutton to zero meter
  • Lamp: pushbutton to activate meter light
  • Calibration controls: accessible from front of instrument (protective cover provided)


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