reedinstrumentswww com4ntone 534 Bluentone 123 Yellowntone 485 Redntone 123 Yellowntone 534 Blueck Rich Black -20/20/20/100Blue - 100/80/30/5Yellow - 0/27/100/0Red - 10/100/100/5Yellow - 0/27/100/0Blue - 100/80/30/5Only if you REALLY need them:SpecificationsDisplay: Dual displayCO Range: 0 to 1000 ppmCO Accuracy: ±5% reading or ±5 ppm (whichever is greater)Temperature Range: -20 to 70°C (-4 to 158°F)Temperature Accuracy: ±0.8°C (±1.5°F)Resolution: 1 ppm / 0.1°Sensor Life: 3 yearsSensor Type: Stabilized Electrochemical CO Specific SensorThermistor Temperature SensorResponse Time (@ t90; in slowly moving air):Carbon Monoxide: 60 secondsTemperature: 10 secondsTemperature Coefficient:0.1 x (specified accuracy)/°C (< 23°C or > 23°C)Operating Temperature: 0 to 50°C (32 to 122°F)Operating Humidity: 10 to 90%RHStorage Temperature: -20 to 70°C (-4 to 158°F)Storage Humidity: 0 to 80%RHHigh CO Alarm: Audible alert when CO level rises aboveprogrammed limitSample Rate: 2 times per secondPower Supply: 4 each AA/R6 batteriesBattery Life: 200-hours continuous (with alkaline battery)Dimensions: 190 x 65 x 45 mm (7.5 x 2.6 x 1.7”)Weight: Approx. 235 g (8.3oz)Accessories: Batteries and Soft Carrying Casewww.reedinstruments.com1-877-849-2127 | info@reedinstruments.com