Multi-Network Type Handheld Detector ?

I know there are little handheld devices that detect active WiFi networks, but does anyone know of any small handheld devices that are able to detect many different types of networks, for example WiFi and Bluetooth all in one.

Thanks for any info.

Id say get a PDA. The cheapest I would Know of is the Palm TX its can be found for a little under $300 and it has 802.11b and Bluetooth.

FLuke networks provide such a device. Otherwise, ham radio equipment will be needed.