LUDLUM 78 Stretch Scope Survey Meter (0.1 ~ 999.9 R/hr; 377.2 cm)

Working environment: splashproof shields for outdoor use (environmental rating IP52)

Detectors: two energy-compensated GM tubes

Energy response: within ±25% of true value from 60 keV–3 MeV

Display: 4-digit LCD with 1.3 cm (0.5 in.) digits, and 6.4 cm (2.5 in.) analog meter

Display range: 000.0–999.9 with indicators of mR/hr and R/hr (Sv display also available)

Measured range: 0.1–999.9 mR/hr or 0.1–999.9 R/hr

Backlight/reset: momentary 2-position toggle switch to activate backlight for preset time, or to zero the meter and display

Meter dial: 0–1k, 4-decade logarithmic

Range selection: 2-position toggle switch to select between mR/hr and R/hr

Linearity: within ±10% of true value

Audio: built-in click-per-event audio with on/off switch

Response: depends on count rate; typical FAST 4–25 seconds, SLOW 4–60 seconds (10% to 90% of final reading)

Power: two D-cell batteries (sealed in handle)

Battery life: typically 250 hours with alkaline batteries (low battery indicated on display)

Meter: 6.4 cm (2.5 in.) arc, 1 mA analog type

Construction: aluminum housing with beige powder-coat finish and polished stainless-steel telescope

Temperature range: −20 to 50 °C (−4 to 122 °F)

Size: 12.2 × 10.9 × 105.9 cm retracted; 377.2 cm fully extended (4.8 × 4.3 × 41.7 in. retracted; 148.5 in. fully extended)

Weight: 2.9 kg (6.4 lb), including batteries

Options:

Case: water-, crush-, and dust-proof wheeled case with custom foam pads (PN 4272-444)

Headphone: dual volume controls, padded ear cups, adjustable head strap, 3 m (10 ft) cord (PN 47-3708)

Datasheet

Manual