if there is division in the amounts field, please also implement subtraction
Small thing: there is an ability to do division in the amount field, for example I can put 2/5 and get 0.4.
How about implementing subtraction? Would be very useful when weighing something by measuring the weight of the container before and after adding the stuff to the pot. Would save having to use a calculator and then transferring the number to Cron-O-meter.