Model 78

Stretch Scope Survey Meter

Part Number: 48-2832

Features

• Range: 0.1 mR/hr to 1000 R/hr
• Telescoping Stainless Steel Pole Extends Reach to 377.2 cm (148.5 in.)
• Dual Analog/Digital Display
• Splashproof Buttons
• Energy Compensated GM Detectors
• Clip-On Adjustable Shoulder Strap

The Model 78 Stretch Scope telescoping gamma survey meter keeps the user at a safe distance from high radiation areas and reaches areas that are difficult to access with other detectors. The wide 0.1 mR/hr to 1000 R/hr detection range is accomplished using dual energy-compensated GM detectors. The backlit digital LCD delivers precise 4-digit measurement values, which can be programmed to display units of R or Counts, and is accompanied by icons and messages indicating the operational status of the instrument. Rate changes are conveniently viewed on the accompanying analog meter. The front-panel controls include separate switches for On/Off, Audio, mR/hr and R/hr range selection, Fast/Slow response, and LCD backlight. A clip-on adjustable shoulder strap is included. The instrument handle may be removed, thereby reducing the collapsed length from 105.9 cm (41.7 in.) to 92 cm (36.2 in.) for easier transport and storage of the instrument.

• Specifications
• Options
• Documents
• Replacement Parts

• Specifications
• Options
• Documents
• Replacement Parts

Specifications

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

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Options

Option	Description	Part Number
Model 78-Series Case	Rugged, watertight, crushproof, and dust proof transport and storage case.	4272-444

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Documents

• Data Sheet
• Product Manual
• CE Certificate

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Replacement Parts

Description	Part Number
Meter Movement	15-8066
Telescope Assembly	4272-304
GM Detector Assembly	4272-284

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