Some time ago, I ordered 100 test tubes for experimentation.
Test tube racks are really easy to make and I didn't want to pay for one!
This one was completely made out of leftover material and therefore free!
- NOTE: when drilling, clamp the two parts together, so that the top holes cover the ones at the bottom!
- the 7 cm of the side part will be the height of the rack, the 8 cm will be glued in the notches.
Tip: The big holes at the two sides make the rack nice to carry!