Portable carbon monoxide detectors

The RV130.53 is an electronic, portable gas detector designed to help installers detect any traces of carbon monoxide that might be present in the home, and to help prevent intoxication when working in dangerous environments. The built-in probe features an electronic cell and is microprocessor-controlled. The detector emits an acoustic alarm when the threshold of 300 ppm is reached, and also displays the concentration of gas in the environment, over a range starting from 20 ppm to a full scale of 999 ppm. The detector is pre-calibrated using controlled gas samples. It is subject to strict testing and is fully guaranteed and self-certified. 
The detector is fully independent thanks to a built-in battery that guarantees about twenty hours of continuous operation. A LED displays battery charge status.