I. Product Overview WASP-D1-E-NO2 nitrogen dioxide NO2 handheld gas detection alarm is the world's smallest portable gas detector, a new generation of imported electrochemical toxic gas sensors, safe and reliable, can be toxic and harmful gases Staff provide security in a hazardous environment. Second, the main features of small size, light weight, easy to carry high measurement accuracy, short response time, wide measuring range color LCD graphic display screen, more comfortable and humane English menu display USB rechargeable lithium battery, long life time, charge fast and convenient built-in large capacity memory, can store large amounts of measurement data strongly audible alarm, vibration alarm variety of alarm mode rugged waterproof and dustproof popular brands proof enclosure protection, high degree of protection to support USB and PC communication, PC calibration warning light flashes to facilitate the work of PPM and mg / m3 conversion in the dark, user-friendly reading three main performance parameters Product Type: Handheld nitrogen dioxide detector with data storage size: 110 * 68 * 38mm Weight: 200g measurement types: nitrogen dioxide, NO2 Range: 0-25 / 100/250 / 2kppm Resolution: 0.01 / 0.1ppm accuracy: 3% Battery: Built-in rechargeable lithium battery operating time: 8 hours to charge the full TV time: less than 4 hours Display: TFT color Alarm: Sound the alarm, the red LED light alarm, vibration alarm Keyboard: 4 keys Sampling Method: Diffusion-type data record: 30 seconds interval can store more than four months of record Calibration: 2-point calibration, the calibration value can be set Operating temperature: - 20--55 ℃ Operating Humidity: 0-95% relative humidity (non-condensing) Sensor life: 2 years