brand new,high quality Features: Oxygen sensor O2-M2 is mainly used to measure the concentration of oxygen gas in the environment. It is widely used in coal mines, steel, petrochemicals, medical, etc. It is typically used in oxygen alarms and atmosphere analyzers. Specifications: (1) Oxygen sensor measurement range (%): 0-30 (2) Working life: > 24 Number of months when 85% of the initial signal is reached (3) Size (mm): 20.316.8mm (4) Output: 80 - 120 A @ 22C, 20.9% O2 (5) Response for time for t90 (seconds): < 15 from 20.9% to 0 (load 47 ) (6) Linearity (ppm): 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. Sold by-Dadangjia