Accurate (Energy-Flat) Ambient Dose Equivalent Rate Measurements
Eliminates High False Readings of Typical microR Meters
Rugged Scintillator, Will Not Leak
Low Range: Background to 19.99 µSv/h (1999 µrem/hr)
High Range: 1 to 1999 µSv/h (0.1 to 199.9 mrem/hr)
Improved Replacement for Bicron Microrem
"/E" Extended Version Has Low-Energy, 3.2 mg/cm² Window for Operation Below 50 keV

Model	Description	Part Number
194	Internal detector with (µ)(m)rem/hr display	48-4364
194/S	Internal detector with µSv/hr display	48-4364-1
194/E	Extended detector with (µ)(m)rem/hr display	48-4388
194/SE	Extended detector with µSv/hr display	48-4388-1

Indicated Use	Low-level radiation surveys
Detector	Internal rugged plastic scintillator, EJ-256
Energy Response	(Model 194 only): Energy-flat within ± 30% relative to ambient dose equivalent from 50 to 1300 keV
Low Range	Background to 19.99 µSv/h (1999 µrem/hr)
High Range	1 to 1999 µSv/h (0.1 to 199.9 mrem/hr)
Display	3½-digit LCD with 10 mm (0.4 in.) digits, backlight, and protective bezel
Controls	Rotary Selector: switches between OFF, battery check, low range, high range Response Switch: toggles between FAST (3 seconds) and SLOW (15 seconds) Audio Switch: audio ON/OFF, built-in unimorph speaker. Sound frequency increases as meter reading increases. Lamp Switch: display backlight ON/OFF Calibration Controls: accessible from front of instrument (protective cover provided)
Over-range Protection	When reading is out of the display range, display shows over-range (leftmost "1" and no other digits)
Power	Two each "AA" cell batteries (externally accessible from the front of the instrument)
Battery Life	Approximately 200 hours, green BAT OK light indicates adequate battery power
Temperature Range	-10 to 50 °C (14 to 122 °F)
Environmental Rating	Water-resistant, IP rating of 65
Construction	Draw-and-cast aluminum case with beige powder-coating
Size (H x W x L)	19.0 x 8.9 x 21.6 cm (7.5 x 3.5 x 8.5 in.)
Weight	1.1 kg (2.5 lb), including batteries

Option	Description	Part Number
Headphone Modification	Adds a headphone jack to the instrument.	4475-118
Shoulder Strap	Adjustable nylon shoulder strap.	4475-120