Knowing how to use specialized equipment and computers, software and other technology is vitally important to research scientists such as marine biologists. For example, they must use field collecting equipment, such as plankton nets for sampling plankton and bottom grabs for gathering bottom creatures. They must also use automated measuring equipment, such as salinometers to measure the salt level in water. In the lab, they use particle counters to count microorganisms in the water and oxygen meters to measure marine organism respiration. Marine biologist must also be familiar with various research boats and ships, and may need scuba diving skills and underwater camera and video skills. Marine biologists also frequently require robotic skills, such as for using Remotely Operated Vehicles, or ROVs, which are used in place of manned submersibles.