 YSI Professional Pro Plus Meter and the first step we're going to do is to calibrate for specific conductance. Washed a probe with still water and a container cup. I'm going to take out the sponge since we don't need that anymore. That's just to keep the probe from being damaged, keep the environment moist. We're going to rinse out the cup a little bit. Then we're going to rinse out the probe. Then we'll take our 10,000 micro seamans for Santa Maria solution. You want to check the date and make sure it doesn't expire, which is good. And you want to pour a little bit of the solution into the cup and rinse out with a probe ideally three times. But for purposes of time we're just going to do this once. Now we're going to fill the cup three-fourths with the conductance solution. And we want to make sure it covers the probe and the hole on the side. Now we can power up the YSI meter. It'll give us the run menu and we want to calibrate. Press calibrate. It'll give us a menu and we want to select conductivity press enter. And we're going to check for specific conductance. It's going to ask us for the units and we're going to check specific conductance in micro seamans per centimeter. And as you can see we are now calibrating at close to 10,000. And what we want to do is record the actual readings and also the temperature. We'll then select accept calibration press enter. Then press cal to finish. And now we're back at the run menu. Once we finish calibrating you want to be sure to write the actual readings down and the temperature as well. So press enter, press cal to finish. And it brings us back to the run menu in which now we can actually do a sample run. First we're going to pour out the solution, rinse the probe, then rinse the cup. With distilled water. Now if we want to test an actual sample of water we take our sample of Hawaiian water, ocean water. We'll pour it in our sample container. Since I'm working with a small cup we can insert the probe directly. And as you can see we're already getting data. We're just waiting for the computer to stabilize the information. And once it's ready you can press enter at the start logging. And we can press enter at the start now selection. And then we're in continuous recording mode so it'll give us 15 seconds worth of data. You can press stop at any time. And the data is already saved inside the computer. Now we're done with the sample. Secure the cup to the probe. Now we're done sampling Hawaiian ocean water. Hawaiian ocean water. So for conductivity we're testing the amount of current. A measuring the amount of current that's being transmitted in the water. The two readings that we get out of the meter specific conductance and temperature correlate to salinity. And salinity relates to how much salt there is in the water. So if there is less oxygen in the water because there could be a high amount of salt that's present. And oxygen is actually important for life and water to persist. So you would see a high death of organisms or slow growth of organisms.