This 252mm wide test tube mount was desigend to be taped on the inner side of a cabinet with double sided tape.

The test tubes were bought from amazon (brand: tuuters, 21mm diameter).

We use them to store flavor powders (brand: instick) which contain about 7,5g powder per package.

We usually use 1-1.5g per 0.75L bottle, which is measured with the custom spoon which is also visible on the picture.

Measure spoon for 1-1.5g from the picture: https://makerworld.com/en/models/451425