If you work in live sound this is a toolbox essential. Most consoles these days have a pink noise facility on the console which can be sent to various outputs.
The pink stick though is more of a test tool. If you work as a stage patch on a festival or need to perform line checks this is the tool you need.
The pink stick has various modes apart from pink including pulse, and 1khz tone. In between each tone is a mute function which is more like power off as you can hear a nosie from a pa system or through headphones when this is switched to a position.
To make the pink stick easier to use and plug into stage boxes I have added a short xlr lead, by short i mean 30-50cm ish, I find It makes it easier to use.
I am very surprised at the low cost of the pink stick. The build quality seems good although the weakest part seems to be the switch knob on the end.
Overall I find the pink stick a great toolbox tool.