Ludlum Model 19 MicroR Meter

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WORKING ENVIRONMENT: Splash proof shields for outdoor use
INDICATED USE: Low level (microR) gamma survey
DETECTOR: 1" X 1" sodium iodide (NaI)Tl scintillator
SENSITIVITY: Typically 175 cpm/microR/hr (137Cs gamma )
ENERGY RESPONSE: Energy dependant
METER DIAL:0 - 25 microR/hr, 0 - 50 microR/hr, BAT TEST
RANGE SELECTIONS: 0 - 25, 0 - 50, 0 - 250, 0 - 500, 0 - 5000 microR/hr
LIGHT: Push-button to activate
LINEARITY: Reading within plus or minus 10% of true value
AUDIO: Built in unimorph speaker with ON/OFF switch (greater than 60 dB at 2 feet)
CALIBRATION CONTROLS: Accessible from front of instrument (protective cover provided)
RESPONSE: Toggle switch for FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading
RESET: Push-button to zero meter
POWER: 2 each "D" cell batteries (housed in sealed compartment that is externally accessible)
BATTERY LIFE: Typically 600 hours with alkaline batteries (battery condition can be checked on meter)
METER: 2.5" (6.4cm) arc, 1 mA analog type
CONSTRUCTION: Cast and drawn aluminum with beige polyurethane enamel paint
TEMPERATURE RANGE: -4 degrees F(-20 degrees C) to 122 degrees F(50 degrees C) 
May be certified for operation from -40 degrees F(-40 degrees C) to 150 degrees F(65 degrees C)
SIZE: 7.8"(19.8 cm)H X 3.5"(8.9 cm)W X 8.5"(21.6 cm)L
WEIGHT: 4.5 lbs(2.1 kg) including batteries