Abstract: An arrangement is provided for the simplified and rapid recalibration of electrochemical toxic gas detectors. Periodically, a single untrained operator may temporarily operate the system of the invention for adjusting the "span" and "zero" settings on the sensor, make two adjustments until he obtains a signal, such as a light signal, in order to obtain recalibration. The arrangement allows the use of untrained personnel to make otherwise technical adjustments in remote regions where gas detectors may be utilized. The system of the invention may be located at the sensing head of the toxic gas sensor or at the controller thereof.