Here is a lot of 3 circuit testers tested and functional.  

Ideal 61-051

GB GRT-500

Trinetics GM-20

I have provided as detailed a description as possible.  Please inspect the pictures and ask any questions before bidding.  Sold as is.  Please check my other listings for more tools.  I will combine shipping, so if purchasing more than one item please request an invoice for exact shipping price.  Check back as I will be adding more tools often.