Gastec® sampling pump with thermal ring can precisely identify and measure over 600 gases and vapors. The easy-to-pull handle and one-stroke preciesion piston action provides field-proven, foolproof operation with no partial samples. Detector tubes incorporate advanced technology for more accurate and reliable analysis with lower stnadard deviation. A direct-read scale printed on each tube means faster sampling time with no confusion, dual scales or concentration charts. Designed, manufactured and calibrated together for precise, accurate readings.