Renee asked that I post this for her.
The web site is mitecalculator.com. Basically, the treatment is the test. After an Oxalic acid vaporization, count the number of mites that drop. Select the number of hours after drop ( max 30 hour). One must observe or estimate how much brood is present and an estimate of the number of bees present in the hive. The calculator will calculate the percentages of Phoretic mites, those in the brood, and then a total percentage of mites in the hive. This is so easy and attempts to avoid a sampling error with alcohol washes.