1,Long Lasting: CO gas detector is made of ABS plastic, comfortable and durable. The service life of the sensor is up to 3 years. 2,Powerful: Portable CO gas tester continuously monitor CO concentrations in the surrounding environment. Make sure excess CO gas is detected and alert the operator to take action. 3,Accuracy And Durability: The high accuracy CO gas tester has an automatic calibration function. The measurable CO concentration range is 0‑1000ppm (accuracy is 1ppm). When the CO gas concentration reaches the alarm level, the sound and light alarm will work. It can measure the ambient temperature in 2 temperature units (℃ and ℉) (temperature range: 0℃ ‑50℃). 4,Practical Design: The handheld CO gas detector is small in size (12x7x3cm), light in weight, easy to carry and operate. 5,Scope Of Application: CO gas tester has the characteristics of wide measurement range, high measurement accuracy, small size, convenient transportation and operation. Widely used in coal, petroleum rigging, textile, chemical, metallurgy, papermaking, fire protection, municipal and other industries. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.