Descriptions:

The GT-526 Particle Counter is a full-featured, battery-operated, portable laser particle counter that provides the functionality of a bench unit with the convenience of a handheld! It can datalog particle counts continuously or send them to a network.
Six preset particle channels (0.3, 0.5, 0.7, 1.0, 2.0 and 5.0) show cumulative counts in real time, with selectable count units.

Specifications:

Measurement Method	Scattered Laser Light
Particle Size Range	Six channels - 0.3, 0.5, 0.7, 1.0, 2.0 and 5.0 microns
Concentration Range	up to 3,000,000 particles per cubic foot (105,900 particles per liter)
Accuracy	+ / - 10% to calibration aerosol
Sensitivity	0.3 microns with 2 to 1 peak to valley (JIS), 20 to S/N
Flow Rate	0.1 cfm (2.83 lpm)
Sample Time	Adjustable: 6 to 999 seconds
Hold Time	Adjustable: 0 to 999 seconds
Light Source	Laser Diode, 35 mW, 780 nm
Power	6V Ni-MH Self-contained battery pack - provides up to 17 hours of typical intermittent use, up to 11 hours continuous operation; full recharge may take up to 15 hours
AC Adapter/Charger	AC to DC module, 100 to 240 VAC to 9 VDC at 350 mA typical
Communications	RS-232 or RS-485
Certifications	Meets or Exceeds ISO, CE, ASTM and JIS international certifications
Interface Display	16 character x 4 line LCD
Keyboard	7 key membrane type
Size	height: 6.25 inches (15.9 cm), Width: 4.0 inches (10.2 cm), Thickness: 2.12 inches (5.4 cm)
Weight	1.94 lbs (31 ounces or 0.88 kg)
Operating Temperature	0 to 50 Degrees Celsius
Storage Temperature	-20 to +60 Degrees Celsius
Included Accessories	Operating Manual, Comet Software, Serial Cable, AC to DC Converter Module with IEC AC Power Cord, Iso-kinetic Sample Probe, Screwdriver, Carrying Case, Zero Particulate Filter