Ackers Science Plastic Test Tube Rack for 13/16 mm Tubes, Holds 50, Detachable (Single)

I did not have assembly issues like others complained about. Shelves are snug and there were no burrs interfering with assembly. End plates will flex out of alignment when trying to slide in shelves, but just be careful and there should be no issues. W just a little care, No reason to break! Individual pieces are strong enough that I would not worry about breakage unless handled negligently. I was a manufacturing engineer for 25+ years and I would say these are good quality design, materials and fabrication. I approve!As you can see in the pictures, I am using it to hold 5ML cryo sample vials. My vials are short and hang by the cap when rack is assembled as intended. This is great for storage in the freezer. When filling and using vials, I can swap the bottom and center plates and use the rack right-side up or upside-down depending on how tall I want the vials sticking up above the top of the rack. I prefer up-side down. it holds the vials a little more securely. The vials can be stood upright or held in the rack in a back leaning angle to facilitate reading of any labels.FYI - My vials are 16mm vials and I was concerned the fit might be tight; especially with the raised volume indicator marks on the outside of the vials. But clearance is perfect.Good purchase and you can't beat the price.

I collect a lot of fountain pen ink samples in vials before I purchase a bottle of it (if I like writing with it) and needed a way to store them (so I can see them easily) but also wanted a place to hold them stable as I swatch any new inks I receive. As you can see from the image, I chose to not use the top insert, but it still works fantastically! I was going to use a tiered lipstick tray but banked on this being what I needed. It def is.

4 out of 5 stars because it's quite flimsy but for the price it's okay.

Scentbird holders are ridiculously priced. This is a great and cheap option to hold your scentbird tubes.

I liked the first one I purchased a while ago so when I needed another, I just ordered it again. Easy to put together, sturdy, & doesn't take up more space than necessary.