Maynard James Keenan

During the recording of "Undertow," an AKG C 1000 mic was used to capture Maynard's vocals, according to this article.

On different videos and threads you can see the microphones. He uses it with APC.

On different videos and threads you see the mic. He uses it with APC on large venues (with a radio system).

seen in this instagram post

i think this is the mic in the instagram post

This microphone is used on Tool live shows, as you see on the image, DPA can be readed on the microphone, close to the XLR output.

The #24 post explains that they use one of these for Maynard's vocals, with Tool.

The article is from an engineer on APC's tours, he explains that he uses two of these.

The article is from an engineer on APC's tours.

The article is from an engineer on APC's tours.

The article is from an engineer on APC's tours.

On different videos and threads you see the microphone.

seen holding the guitar in this image

Using "the Ringer" as a mic holders in "Puscifer" live preformances

Around 30 seconds you can see Maynard holding a megaphone, after some researchs and comparisons with other videos, I found that this is the RadioShack Powerhorn (not producted since years).