Hi Rollo and others.
Fluke are very good but pricy, especially if you only want to bias your tubes.
Of course on Amazon.com there are tons of multimeters,
I would go with anything between 30 to 60 USD with the proper scale.
They should be accruate enought for the task.
No special recommendation, however,
look at the comments, if they sold 100, 500 or 1,000 should means that it's not too bad....
I've just bought a Sanwa, but not very popular in North America,
but got a good reputation in Asia, as good as Fluke for less than half the price.
Not sure of this is of any help, but I am trying to help.
Guy 13