Taking a reading

 

I can remember the first time I owned a electrical multi-meter, it would of been around the age of eight and it was an analogue display model rather like this one except mine was made Tandy/Radio Shack at the time.

It's good you can learn to use use in Scouts as you can check if a battery is "dead" or not, trace continuity in wiring in case a broken connection is causing issues and use it as tool in fault finding using a schematic/circuit diagram with information such as Voltages at points shown to find where the fault is.

It is a most useful skill.