Changed the round holder to rectangular then scaled it up slightly as the 3rd party hygrometers are a bit too tight for my liking.
 

I liked the original model's idea of drilling a hole in the rib of the box lid but, I prefer to use the rectangular hygrometers. Took their hanging design and made a holder that has a large release spot so the meter could be removed/replaced more easily.

The original design calls for a M3x12 machine screw but, I ended up using a M2x12 screw and nut as I wanted to drill as small as possible of a hole in the lid rib.

I used these hygrometers with the 101% profile: [https://www.amazon.com/dp/B0CXHS6CYS](https://www.amazon.com/dp/B0CXHS6CYS)
Used one M2*12 socket head machine screw and nut from this kit: [https://www.amazon.com/dp/B07K1DV93T](https://www.amazon.com/dp/B07K1DV93T) 
EZY Storage Box can be found from various retailers, I grabbed mine from home depot: [https://www.homedepot.com/p/Ezy-Storage-18L-19Qt-Waterproof-Clear-Latch-Tote-IP-67-FBA34060/314650516](https://www.homedepot.com/p/Ezy-Storage-18L-19Qt-Waterproof-Clear-Latch-Tote-IP-67-FBA34060/314650516) 
Side note, the Bambu store rectangular hygrometers are deeper, they would fit the original profile better, but extend out the back of the bracket slightly.