Ranges:CO: 0 to 1000 ppm, overflow 2000 ppm; CO2: 200 to 4000 ppm, overflow 9999 ppm.Accuracy:CO: ±5 ppm<100 ppm; ±5%>100 ppm; ±10%>1000 ppm. CO2: ±20 ppm<400 ppm; ±5%<4000 ppm; ±10%>4000 ppm.Resolution:CO: 1 ppm; CO2: 1 ppm.Display:Dual LCD display.Temperature Limits:32 to 104°F (0 to 45°C).Humidity Limits (Non-Condensing):10 to 90% RH.Power Requirements:100 to 240 VAC, 50 to 60 Hz or (5) AA NiMH batteries, internal, factory replaceable.Battery Life:6 hours with full charge and pump on.Weight:2.21 lb (1 kg).Agency Approvals:CE.