You should get yourself a digital infrared thermometer. You can get them cheap everywhere. If you want to make good anything waxy it’s 8mportant to know the exact temp. Many waxes need to be poured at a temp plus or mins a couple degrees to pour just right. If you melted your wax and then just poured into clamshell without know the temp that’s goi g to be an issue for you for multiple reasons. Too hot, sinkholes in wax, too low possible graininess, too hot melt your plastic clamshell etc.
you want something like this…
https://www.homedepot.com/p/ProHT-Digital-No-Touch-Infrared-Thermometer-05145/314213680