Senko SP2nd O2 Gas Detector estimates one gas constantly and show its fixation and raise a caution when a hazard happens.Features of O2 Gas Detector• Rubber material case for the stun security.• The great water evidence/dust verification structure.• High execution perceptible, visual, vibration caution.• Setting first, the second caution.• Automatic checking of the sensor inconvenience.• Data logging.