I have been looking at getting my own bias meter and this one looks to be a great unit. Wanted to check and see if anyone has used this before or their thoughts on it. Basically it will do a 2 or 4 tube bias by plugging their conectors into the tube sockets and then putting the tubes into the conectors. Looks to be real simple. Here is a video on how to use it.
http://www.mojomusicalsupply.com/video-biasing.asp
Measures the current of 4x any standard base octal power tubes (6L6, EL34, 6550, etc). Measures EL84 current with optional noval proble set. See item #4152010 Bias Master EL84 Adapter