Stretch Scope - Model 78-6
CE Seal

The Ludlum Model 78-6 Analog Stretch Scope features a 2.5 x 2.5 cm (1 x 1 in.) NaI (T1) NaI (T1) scintillator mounted on a 3.7 m (12 ft) extendable pole to offer an optimum optimum performance in counting low-level gamma radiation. The NaI scintillator is scintillator is energy sensitive, refer to the energy response curve for the relative response.  The gamma scintillator measures gamma radiation from 1 µR/hr to 5000 µR/hr (.01 µSv/h to 50 µSv/h).
Five range divisions are provided in the 0–5000 µR/hr spectrum. The meter face is made up of two scales, 0–50 and 0–25, plus battery test. The 0–50 scale corresponds to the 50, 500 and 5000 positions on the range selector switch. The 0–25 scale corresponds to the 25 and 250 positions on the range selector switch.
Other instrument features include Dead Time Correction (DTC) to compensate for detector dead time; audible click-per-event with programmable 1, 10, 100, and 1000 divide-by; LCD backlight with programmable "on" time; programmable fixed or variable response time, and a count overflow visual alarm.

Model 78 Configurations and Transport/Storage Case

Model 78  dual GM detectors, display range 0.1 to 999.9 mR/hr
Model 78-1 dual GM detectors, display range 1 µSv to 9999 mSv/h
Model 78-6 1 x 1 in. NaI(T1) detector, display range 1 to 5000 µR/hr
Model 78-9 GM detector, display range 000.0 to 999.9, indicators of µSv/h and cps
Transport/Storage Case - Model 4272-444 : watertight, crush- and dust-proof rugged carrying or storage case with protective foam padding, wheels, and stainless steel pins, and padded handle  134.6 x 40.6 x 134.6 cm (53 x 16 x 6.1 in.) (L x x W x D)