Measure it Pro is accurate to the drink served instead of three drinks.
Measure it Pro reads the bottle by the actual drinks left in the bottle versus by the points. If the bartender starts with a full bottle and serves 4 drinks, he could interpret this as either 0.8 or 0.7.
In the world of banquet bars, you have the business demands during the cash bar event to reconcile the revenue to what was served, what was returned, what revenue was collected, and what was the variance. Measure it Pro allows you to read each liquor bottle to the drink and compare that to your point of sale system when recording the transaction with the guest.