I've used soil pH test kits in the past where you mix the soil with a solution and look for a color change. This works OK for dirt, but sometimes I'd like to know what the final pH of my planting mix is (a combination of mulch, compost, sand, clay). Since my planting mix is high in organic matter (wood, etc.) it doesn't really stir into a solution very well.
Is there another type of pH test that would work well for soil with high organic matter?