API/Aquatic Test Tube Holder

Another API Master Test Kit Test Tube HolderWe'd been using a wooden block with holes drilled into it for a while, but after I recently broke a bunch of tubes from knocking them out of the block I wanted something that held them much, much, more securely.Since making this I see there are some other excellent models on here but I'm going to stick with mine. Designed as much to store the tubes as to hold them while testing. Holds 5 tubes as we do low range pHand high range pH testing for our turtle pond.Tubes easily slide in to the top (now - I had to file mine, the model is fixed) and will rest on the bottom, a gentle push will snap them in place and they won't even fall out if you turn it upside down (tho don't try that at home ;))Also has 2 holes running through the base you can use with ¼ inch/6.4mm steel balls for extra weight