Measuring Range : (2.5) to 60 ppm Number of pump strokes : 1 (100mL) Correction Factor : 1 Sampling Time : 1 min Detecting Limit : 0.1 ppm (10 pump strokes) Colour Change : White to Brown Operating conditions : Temperature 0 to 40 ℃ (32 to 104 ℉) correction not used Relative humidity 0 to 90 % correction not used Relative Standard Deviation : 5 %（for 2.5 to 60 ppm） Tube quantity and number of tests per box : 10 tubes for 10 tests Shelf life : 36 months