Extra alarms can be added as needed and the unit does not need periodic calibration.
Standards such as EH40 and TUV in Europe mandate that employees and members of the public are not exposed to potentially dangerous levels of CO2 as it is a highly toxic gas in relatively small quantities.  The Ax60K is an affordable, easy to operate CO2 monitor and is ideal for ensuring safety in areas where the gas is piped or stored.
The Ax60K sensor needs to be installed around 450mm above the floor - this is because CO2 is heavier than air and can collect at low levels. The alarm should be located above the sensor at about head height (between 1800mm and 1950mm) or at the entrance to the kiosk.