 Okay, briefly, just a brief video about balancing your centrifuge tubes. We can't state enough the importance of counter-balancing your sample tubes when you're running the centrifuge. And a simple way of doing that is with a trip balance. Here we have a two-pan dual beam balance, and in the balance position it's going to have the marker there on that line. We can have two ways we can do it. The first example here I'm going to have sample tubes to be spun in their carriers. It's going to be placed in the centrifuge, and as I have included the cap there, of course, that's going to go into the centrifuge, and so all I'm going to do is add water as the balancer. So I'm just going to add this water carefully until those tubes are balanced. So that would balance these tubes in the carrier. Now what if you need to balance your tubes? You don't have the carrier or the carrier's cumbersome or whatnot, you can balance them without a carrier when you're using a dual beam balance so that you can actually adjust the balance. So I have these just kind of random tube holders that we see they're not balanced. So the heavier one is over here on the pan that I can adjust. I'm going to actually put the lighter one there, and so what I'm going to have to do is to balance them against each other here. Then I can balance. Okay, so there you go. There's just two ways to use this dual pan balance to balance the tubes against each other that you're spanning. You can either do it in the carrier and tube and all that's going in the centrifuge, or you can balance the tubes that are going in the carrier.