Internal Halogen-quenched, uncompensated GM tube with thin mica window, 1.4-2.0 mg/cm2 areal density. Effective diameter of window is 45 mm (1.77 in.).
mR/hr – .001 (1µR) to 100
CPM – 0 to 350,000
µSv/hr – .01 to 1000
CPS – 0 to 5000
Total Counts- 1 to 9,999,000 counts
Detects Alpha down to 2 MeV. Detects Beta down to .16 MeV; typical detection efficiency at 1 MeV is approx. 25%. Detects Gamma down to 10 KeV through the detector window. 3340 CPM/mR/hr (137Cs). Smallest detectable level for 125I is .02 µCi at contact.
Sulfur (35S), Strontium (90Sr/y), Cesium (137Cs), Phosphorus (32P), Carbon (14C), Iodine (131I), Cobalt (60Co), and Alpha
Graphic LCD with Backlight
Meter will hold at OVER RANGE in fields as high as 100 times the maximum reading.
This radiation detector display updates every 3 seconds. At low background levels, the update is the average for the past 30-second time period. The timed period for the average decreases as the radiation level increases.
USB for use with Free Observer USB Software for PCs
Bluetooth for use with the Free Observer BLE App for Android.
Red LED flashes with each radiation event.
Internally mounted beeper (can be switched off for silent operation)
USB Power or Two (2) AA alkaline batteries (included). Approx. 800 hrs @ background.
Reference to Cs137
Typically ±15% from factory, ±10% with NIST Source Calibration NIST Calibration Additional
Selectable Alert Settings
mR/hr .001 – 100 and CPM 1 – 350,000. Pulsating beeper sounds the alert. Adjustable alert levels are used for mR/hr / CPM, and µSv/hr / CPS. 70db @ 1m. Alarm will sound when in Timer Mode when set alarm threshold is reached.
-10° to +50°C (14° to 122°F)
10% to 70% Non-Condensing.
140 X 68 X 33 mm (5.5 X 2.7 X 1.3 in.)
291g (0.64 lbs.)
Carrying Case, Xtreme Boot, Lanyard, Stand, Batteries, Mini-USB Cable, Observer USB Software, Observer BLE Software, Certificate of Conformance
Wipe Test Plate, Swipes, Water Resistance Case, NIST Calibration
1 year limited warranty