I was watching this old EEVBlog video: EEVblog #168 – How To Set Up An Electronics Lab and Dave recommended a Fluke VoltAlert. I discovered there are various versions, such as the 1AC and 2AC, and those alternatives are explained here: Best Non-Contact Voltage Tester.

The Fluke 1AC II Non-Contact Voltage Tester looked like a pretty good one for my purposes and I found one on eBay for AUD$35.40 so I hit the buy button.