Portable gas Analyzer is the most advanced hand held VOC detector on the market with the widest measurement range, accurately detecting gases down to ultra low ppb levels up to 20,000ppm. Portable gas analyzer has the fastest response time of just two seconds, and is as quick to clear down. Its internal gas table contains over 480 response factors. The instrument's photoionisation detection (PID) technology has been independently verified as best performing on the market for speed, accuracy, resistance to humidity and contamination.