The PLSS was high, wide, and deep. It was tested at the Houston Flight Center by James P. Lucas, working for Hamilton Standard, and by various astronauts in neutral buoyancy tanks at Dallas. It was tested in space for the first time by Rusty Schweickart in a stand-up EVA in Earth orbit on Apollo 9. His PLSS weighed on Earth, but only 14 lb (equivalent to the Earth weight of ) on the Moon. The OPS weighed on Earth (6.8 lb (equivalent to the Earth weight of ) on the Moon).