The invention relates to a handheld aesthesiometer, comprising a source of a pressurised gas； a gas lung connected with intermediation from first valve means to the source of pressurised gas and comprising an expandable cavity intended to house a volume of gas supplied by the gas source in a loading phase of the aesthesiometer； an outlet nozzle connected to the gas lung with intermediation from second valve means and suitable for directing a puff of the volume of the gas housed in the gas lung in a firing phase of the aesthesiometer； and a mechanism to ensure in the aforementioned firing phase of the aesthesiometer the release of the puff of the volume of gas contained in the gas lung in the direction of the outlet nozzle by means of a controlled contraction of the expandable cavity of the gas lung in order to ensure a substantially constant outlet pressure.
