I am showing you all how I have been raising some of my desert scorps such as Androctonus spp and Hottentotta spp. I see no reason why this wont work for other desert scorpions such as Leiurus, Parabuthus,Vajoevis and others as well. This is not the only way to do this nor do I say it is the best but I have had great success at doing it this way.
The early instars are kept in small condiment cups with sand. These cups are too small to place a hide in so I keep the cups in a box which stays dark.
I can usually tell when one is approaching a molt (at least on A bicolor). When this happens I will put a very small amount of water on 1 side of the cup (see picture below) but one has to be very very careful not to add to much or they can get mycosis. If the water does not dry out in about 2 days change the sand so it will be back on dry substrate. About 70% of the time when I do this they will molt within 2-3 days.
Fixing the lid (like in the pic below) would probably be better because the moisture would dry out easier
While not a necessity, My "Hot Box" certainly speeds growth and seems to reduce deaths during molting. This is very crude as you can see and I will certainly have to make a better set up as I breed more and more scorpions. It is a styrofoam box with a reptile heating pad (wrapped in towels) to one side. With the box 3/4 covered the temps stay between 85F-90F.