Indicated Use	Alpha survey
Detector Type	Air proportional
Window	0.4 mg/cm² aluminized mylar
Window Area	Active: 154 cm² (23.9 in²) Open: 100 cm² (15.5 in²)
Efficiency (4π)	²³⁹Pu: 8%
Operating Voltage	Altitude sensitive Sea Level: 2050 V 610 m (2000 ft): 2000 V 1524 m (5000 ft): 1925 V 2134 m (7000 ft): 1875 V
Counter Threshold Setting	1.5 to 2 mV (typical)
Working Environment	Desiccant-vented chamber for outdoor use
Size (H x W x L)	10.2 x 8.9 x 23.6 cm (4 x 3.5 x 9.3 in.)
Weight	0.7 kg (1.5 lb)

Model	Description	Part Number
Model 12	Analog Survey Meter	48-1609
Model 16	Analog Survey Meter Adjustable window	48-1612
Model 18	Analog Survey Meter Adjustable window 3 detector setups	48-1613
Model 177-61	Benchtop Analog Meter Adjustable audio & visual alarm HV Range: 400 to 2500 V	48-1382
Model 2000	Scaler Scaler Range: 0 to 999,999 counts Timer: 0 to 999 minutes	48-1648
Model 2200	Scaler-Ratemeter Scaler Range: 0 to 999,999 counts Ratemeter Range: 0 to 500,000 cpm Timer: 0 to 999 minutes Adjustable window	48-1651
Model 2221	Analog Scaler-Ratemeter with Digital LCD Single channel analysis	48-2065
Model 2241	Auto-Ranging Digital Scaler-Ratemeter RS-232 port	48-2444
Model 2350-1	Digital Datalogging Meter Stores 1000 data points Supports 16 detector setups	48-2751

Description	Part Number
Window Assembly	4312-036
Dehydrators	03-6017