This hand held Spirometer measures lung capacity without the need for water. It’s advantage over the conventional tank-type Spirometer is it’s portability & ease of operation enabling it to be used for physiological experiments in the field as well as indoors. Lung capacity is easily measured by breathing into the mouthpiece and noting the readout on a dial at the top of the Spirometer. Range capacity is -1000 to +7000 cubic centimetres. Supplied with 50x mouthpieces.