I hate, despise, and absolutely loathe the plastic container that the API Freshwater Master Test Kit comes with. Did I mention I don't like it?!
So I DIY'd my own version using scrap wood and materials I had lying around.
Total cost: $0 (all scrap materials)
I highly recommend wenge wood for any projects you use. It's not even sanded/oiled in these pictures and it's a GLORIOUS color/pattern. I had this bit left over from when I made a ring box for my fiancée/now wife.
I simply cut it to length, set my circular saw to 1", and made two cuts, one down then one into the side to cut out a chunk that allows the bottles to sit in front.
The gold trim piece is one of those that you use to join two sections of flooring, like tile to wood or wood to carpet, etc. I don't know what they're called, I just found it at Home Depot a long time ago for a different project!
The holes are 5/8" the depth of the caps, then inside the 5/8" hole, a 1/2" hole drills deeper to hold the tubes when testing. This way, when testing, the tubes with the caps on top sit inside the 1/2" hole. After I'm done, the tubes sit with an open top to dry and the caps hold the tubes inside the 5/8" hole.
All these words aren't helpful because I'm bad at explaining. How about some pictures?
5/8" holes to hold the caps. Inside the 5/8" holes are 1/2" holes drilled deeper which hold the tubes when the caps are on top of the tubes. There's a better pic down below of what I mean.
Wenge wood. I haven't sanded/oiled it yet, but it's gonna look glorious when I do.
Takes up less real-estate overall in my drawer. Obviously is much wider than the plastic kit, but I like it much better this way.
Holds the tube+cap either way. On the left with the cap in the hole for drying out the tube between uses, on the right while checking the water.
I'd like to add some sort of handle, but don't know what to do without ruining the look! I'll have to think on it. Maybe some sort of drawer handle that just sticks straight out the back a little bit that would be easy to hold on to.