Ludlum 3 survey meter geiger counter radiometer 44-7 probe radioactivity

COMPATIBLE DETECTORS: G-M,scintillation
METER DIALS: 0 - 5k cpm or ,0 - 2 mR/hr,w/BAT TEST ( others available )
METER: 2.5" (6.4 cm)arc,1 mA analog type
MULTIPLIERS: X0.1,X1,X10,X100
RANGE: Typically 0-200 mR/hr,or 0-500,000 counts/minute(cpm)
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 400 - 1500 volts
THRESHOLD: Fixed at 40 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 powder-coat
TEMPERATURE RANGE: -4°F(-20°C) to 122°F(50°C)
SIZE: 6.5" (16.5 cm)H X 3.5" (8.9 cm)W X 8.5" (21.6 cm)L