Having seen people using cameras to keep an eye on powder levels within a case, saw a cheaper option. Wifi Endoscopes are available for around 40$ and can be set up in less than 5 minutes.
The hardest part is working out how to mount the monitor! Here is a link to the Youtube setup on my 650.
The beauty is you can use it for other jobs such as barrel inspection, etc.
Wifi Endoscope