This simple but effective device comes in two versions. Both include a modified airtight plastic syringe supported between two wood blocks. Placing various weights (not included) on the upper block compresses the gas, allowing pressure and volume measurements to be made to verify Boyle's law. The second version also includes a wood support with holes for the syringe and a thermometer (not included) to allow suspension in a beaker of heated water for verifying Charles' Law. Instructions are included.