I’m sure no mater what UV torch you have, you will found them with your UV torch either 395 or 365nm although the scorpions fluorescein better with the 365nm.
I found Boma fires ( heat ) in the evenings attract them as well , safer to wear shoes at night in scorpion areas.
Some more reading http://www.scorpions.co.za/
I found this UV torch which is only a few bucks more from Torchsa much better https://torchsa.com/ultraviolet-uv-flashlight/334-ultraviolet-uv-flashlight-uv-28-led-flashlight.html?search_query=UV&results=1 than the Zartek from etc Zartek 9 LED UV Scorpion Flashlight | 1000523 | Outdoor Warehouse
I have Convoy LG and Nichia UV torches (not much difference between them in my opinion ) , as said they are in a different league for a little bit more.
As mentioned try to use polycarbonate safety goggles (they are inexpensive) for safety, I found the yellow one’s best for me, I tend to get headaches very quickly not wearing the safety glasses
Hope you enjoy your visit in South Africa, unfortunately crime is more of a danger than scorpions, just be aware .