Ludlum Model 3 Survey Meter

A Ludlum Model 3 with super sensitive PR-1117 probe. This probe has a huge crystal, used for detecting N.O.R.M. and other hard to detect radioactive materials. Probe is 10 inches long by 2 1/2 inches Dia.

PART NUMBER:48-1605
INDICATED USE: General purpose survey
COMPATIBLE DETECTORS: G-M, scintillation
METER DIAL: 0 - 2 mR/hr, or 0 - 5k cpm, BAT TEST (others available)
MULTIPLIERS: X0.1, X1, X10,X100
LINEARITY: Reading within ±10% of true value with detector connected
CONNECTOR: Series "C" (others available)
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)
HIGH VOLTAGE: Adjustable from 200 - 1500 volts
THRESHOLD: 30 mV +/- 10 mV
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 greater than 2000 hours with alkaline batteries (battery condition can be checked on meter)
METER: 2.5" (6.4 cm) arc, 1 mA analog type
CONSTRUCTION: Cast and drawn aluminum with beige polyurethane enamel paint
TEMPERATURE RANGE: -4F(-20C) to 122F(50C)
May be certified for operation from -40F(-40C) to 150F(65C)
SIZE: 6.5" (16.5 cm)H X 3.5" (8.9 cm)W X 8.5" (21.6 cm)L
WEIGHT: 3.5 lbs. (1.6 kg) including batteries