Hi Cary, I use the same jar (mainstay 16oz) and with CBA soy used the HTP 126 and it worked well, try a 105. You can melt it down, either by double boiler or in oven set at 200*, then pour into new tester jar. This may slightly alter ht but sounds like your just testing for wick sizing so you'll be fine. You can find CDN's at Southwestcandlesupply.com or CD's at Lonestar...either will work but the CDN's are specifically for soy HTH :smiley2: