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  • Ludlum Model 12 General Purpose Survey Meter -Older version

$1,390.00 $620.00

3 in stock

SKU: 4169585543-1-1-1 Product Type: , Vendor:

This is the older version of Ludlum’s model 12 with C connection.

This general purpose, handheld analog ratemeter supports GM, proportional, and scintillation type detectors. The analog meter face comes in a variety of options to support the measurement units and ranges for the optional external detector selected.

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 four-decade range, instrument shut-off and battery test, an audio on/off switch, a fast/slow response switch, a high voltage display button, and a count reset button.


  • Low Price
  • Rugged
  • 4-Range Analog Ratemeter
  • Supports GM, Proportional, and Scintillation Type Detectors
  • Greater Than 2000 Hour Battery Life

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plication Alpha, Beta, and Gamma Surveying
Compatible Detectors GM, Proportional, Scintillation
Detection Range Dependent on detector
Linearity Within 10% of true value with detector connected
Meter Dial 0 – 500 cpm, 0 – 2.5 kV, BAT TEST
(Meter Faces tab lists other available meter faces)
  • Rotary Selector Switch: Off, Battery check, Range selections: ×1, ×10, ×100, ×1000
  • Response Switch: Toggles between FAST (4 s) of SLOW (22 s) from 10% to 90% of final reading
  • Reset Button: Zeroes meter
  • High Voltage Check Button: View high voltage setting on meter face
  • Audio Switch: On/Off, Built-in unimorph speaker, 60 dB at 61 cm (2 ft)
  • Calibration Controls: Accessible from front of instrument (protective cover provided)
High Voltage Adjustable from 400 to 2500 Vdc
Threshold -1 to -100 mV
Window No
Overload Optional
Temperature Range -20 to 50 °C (-4 to 122 °F)
May be certified for operation from -40 to 65 °C (-40 to 150 °F)
Power Two each “D” cell batteries (housed in an externally accessible sealed compartment)
Battery Life Typically greater than 2000 hours (battery condition can be checked on meter)
Construction Cast and drawn aluminum with beige powder coating
Detector Connector Type “C” series (others available)
Size (H x W x L) 16.5 × 8.9 × 21.6 cm (6.5 × 3.5 × 8.5 in.)


Additional information

Weight 7 lbs

12SA (with Alarm)