... agriculture, etc2.Technical characteristics high precision, high resolution broad range, the most massive ranges from 0 to 50000ppm or 0 ... maintenance of equipment beset by changing light no longer Entire range range of digital temperature compensation through three buttons can realize view ... , long time use if brightness is new.3.Technical parametersMeasuring range: 0-5, 10ppm 0-1, 50, 100, 200ppm ...