REED 77535
Indoor Air Quality Meter

Dew point and wet bulb temperatures can also be displayed
Instantaneous readings are displayed on a high resolution LCD with backlight
Displays STEL readings (Short-term exposure limit) over a 15-minute period and TWA readings (Time-weighted average) over a period of 8 hours
Hold function freezes displayed reading
Maximum, minimum and average functions
Low drift, non-dispersive infrared CO2 sensor
Audible warning alarm of excessive CO2 concentrations
RS-232 serial interface

REED 77535 Shown

Specifications
Ranges	CO₂	0 to 5,000 ppm
	Temperature	-10 to 60°C (14 to 140°F)
	Humidity	0 to 99.9% RH
	Dew Point	-73.4 to 60°C
	Wet Bulb	-13.3 to 60°C
Resolution	CO₂	1 ppm
	Temperature	0.1°C/°F
	Humidity	0.1% RH
Accuracy	CO₂	±5% rdg. ±50 ppm
	Temperature	±0.6°C (±0.9°F)
	Humidity	±3% RH @ 25°C (10 to 90% RH) ±5% RH <10% & >90%
Sensors	CO₂	Non-Dispersive Infrared (NDIR)
Sensors	Humidity	Rotronic capacitor
Response Time		30 seconds
Physical Dimensions	Power Supply	4 x "AA" batteries
	Battery Life	24 hours
	Alarms	Audible: 80dB