how do you check for a spark on your own?

[Alex56]

I'm trying to solve an intermittant fault single handed, if I'm on my own how can I check for a spark at the plug?

Thanks for any good ideas

Alex

PS This van doesnt have a rev counter (so cant look at 'needle bounce')

[ninja.turtle007]

Record it with a camera?

[Alex56]

that works for me! thanks Tom