CO Gas Tester Handheld CO Gas Detector Digital Gas Tester With Sound Light Alarm 1ppm Resolution Item Type: CO Gas Detector Material: ABS Weight: Approx. 150g / 5.3oz Product Size: Approx. 12x7x3cm / 4.7x2.8x1.2in Sensors: Electrochemical Principles Detected Gas: CO Detection Concentration: 0-1000ppm Display Unit: ppm Resolution: 1ppm Error: ±10% Alarm Instruction: Sound And Light Alarm Factory Alarm Point: Low Alarm Point 35ppm, Low Frequency Buzzer And Light Flashing, Alarm Point 70ppm, Medium Frequency Beep And Light Flashing, High Alarm Point 200ppm, High Frequency Rapid Beep And Light Flashing. Batteries: 3 x AAA Dry Batteries (Shipped Without Batteries) Temperature Range: 0℃-+50℃ Humidity Range: 15%-90%RH (Non Condensing)