1 L/min respiratory flow head suitable for use with rats and mice. The head is constructed from acetal plastic and weighs approximately 14 g.

10 L/min respiratory flow head suitable for use with rabbits or other similar sized animals. The head is constructed from acetal plastic and weighs approximately 22 g.

300 L/min respiratory flowhead suitable for use with adults at rest and for certain lung function tests at constant breathing rates. The head is injection moulded in ABS plastic, comes as a complete single unit and weighs approximately 37 g.

1000 L/min respiratory flowhead suitable for use on adults during exercise or for lung function tests including hard breathing or exercise testing. The head is constructed from ABS plastic and weighs 260 g.