Thanks all. What I'm doing is using a cheapo vernier caliper (I think it was less than 10 bucks at home depo) that reads to .1mm. Using the inside measurement part of the vernier, I set it to 106mm and put it between the links, as I open the vernier, it stretches the chain automatically and then I just set it till I get a little friction as I remove the vernier, much like using a feeler guage. The stretch limit on the legnth I'm measuring is .55mm, so the cheapo vernier is more than accurate enough.