The Digital Boyle's Law Apparatus can be used to demonstrate the relationship between pressure and volume of gas.It is capable of:Enclosing volumes of airChanging the volume and pressure of the airMeasuring pressures and volume changesThe unit consists of a 29mm diameter graduated cylinder with a piston and a screw valve. The cylinder acts upon a manometer through a narrow passage of 60mm diameter. The manometer dual scale is from 0–4 x 10^5 Pa and 0–58 PSI with the needle set at atmospheric pressure.Mounted on durable metal baseTotal height: 211mm Manometer dual scale is from 0-4 x 10^5Pa and 0-58 PSI with needle set at atmospheric pressureRequires 1.5 v AA battery for operation