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  • Ludlum Model 77-3 Stretch Scope, All calibrated until 02/2025
Sale!

$6,000.00 $3,000.00

Indicated Use High-activity gamma survey with telescoping detector, 3.6 m (12 ft) fully extended
Detectors 2 energy-compensated GM tubes
Energy Response Within 25% of true value from 60 keV to 3 MeV
Linearity Reading within 10% of true value
Display 4-digit LCD with 1.3 cm (0.5 in.) digits, and 6.4 cm (2.5 in.) analog meter
Display Range 000.0 to 999.9 with indicators of mR/hr and R/hr (Sv display also available)
Meter Dial 0 – 1k, 4-decade logarithmic
Meter 6.4 cm (2.5 in.) arc, 1 mA analog type
Backlight/Reset Temporary action 2-position toggle switch to turn backlight on for preset time, or zero meter and display
Range Selection 2-position toggle switch to select between mR/hr and R/hr
Audio Built-in click-per-event audio with ON/OFF switch
Response Dependent on number of counts present. Typical times: FAST 4 to 25 s, or SLOW 4 to 60 s, from 10% to 90% of final reading
Temperature Range -20 to 50 °C (-4 to 122 °F)
Working Environment Splashproof shields for outdoor use
Power 2 “D” cell batteries (housed in sealed handle)
Battery Life Typically 250 hours with alkaline batteries (low battery indicated on display)
Construction Aluminum housing with beige powder coat paint, and polished stainless steel telescope assembly
Size (H x W x L) 12.2 x 10.9 x 105.9 cm retracted; 377.2 cm fully extended (4.8 x 4.3 x 41.7 in. retracted; 148.5 in. fully extended)
Weight 2.9 kg (6.4 lb), including batteries

3 in stock

Product Type: Vendor:

Photos show actual units for sale.

  • Analog + Digital Meter
  • Extends to 3.6 m (12 ft.)
  • 2 Energy-Compensated GM Detectors
  • Range: 0.1 mR/hr to 1000 R/hr

For internal use:

Barcode 18452720, 18452721, 18452722

Location 8A

Additional information

Weight 10 lbs
Dimensions 45 × 10 × 10 in