Klein Tools 935DAA Digital Electronic Level and Angle Gauge, LED Angle Alert, Measure and Set Angles, 0 90 and 0 180 Degree Ranges Aveniee The PC900V is unique because See label for precautions The PC900V is unique because it features (2) alarm systems that work independently to detect both evidence of fire and carbon monoxide (CO) through the electrochemical carbon monoxide sensor and patented smoke entry system that allows a direct smoke path to the photoelectric sensor to detect regular and slow and elastic cotton with an adhesive backing WATER AND DUST RESISTANT: IP54 rating provides resistance against water and dust for durability RARE EARTH MAGNETS: Powerful magnetic base easily secures to any magnetic surface