📦 Heathrow Scientific HS29022G Assorted Polypropylene Products Review

I bought for biological laboratories. They interested me because the holes for the standard test tube are completely open, which allows them to be fully positioned in the rack. Multiple tube holders from other companies do not. This will hold 4 sizes: 50mL screw cap tubes, 16 x 125mm tubes, 1.5mL centrifuge tubes and microcentrifuge tubes (not sure if 0.2 or 0.5).

Bought these from Revain because they were cheaper than my university's lab supplies supplier. The product is durable and the holes for installing various pipes are well-formed. Falcon 50ml, 15ml tubes are well suited. As well as standard microcentrifuge tubes (0.5, 1.5, 2 ml). I've tried assembling individual racks into larger blocks and this is where the racks fail. Only two of the 5 packs could fit together. All others had slide locks that differed 1-2mm and therefore did not match other…

I ordered these for my high school students and they are totally impractical for test tubes. I was looking for something that would wash and pack easily and fit into our small budget and I thought this would work well. As the students place their 15mL tubes on the rack and lift it, the tubes will fall out of the large holes on the opposite side. I thought I solved this problem by flipping the stands and using tubes that are slightly larger than the holes on the bottom so they can't fall…