In the morning I bought a multi lens set for smartphones at the Action store in Naaldwijk for €3.89. The set comes with a 10× macro lens, which doubles as a 0.65× wide angle lens, a 185° fish eye, 2 lens covers, 2 clips, a pouch, and an adjustable LED ring light with USB charger cable.
In the early afternoon I took a few photos. In the above photo you can see the smallest tarantula sling I keep, a Hapalopus sp. Colombia "large". Also visible in the photo is the silk lining of its burrow.
I currently keep just one scorpion, a Chaerilus sp. "Java". It's currently second instar, meaning it has molted once since it was born. It also means it's very tiny, just a few mm.
It's unclear to me how much the macro lens actually magnifies but it allows me to get closer to the subject while my phone, an iPhone 5, is still able to focus.
The adjustable LED ring light works great; it has 3 brightness settings.