BTW, "piezo" is frequently mispronounced. It comes from the Greek work meaning "to bend," and with the Greek vowels, says "pee-eh-zo", not "pie-" (as in "apple pie"). Classical Greek had the "d" sound in front of the "z" sound, so "pee-Ed-zo" would be correct too. (Take if from our son whose undergraduate degree was in Greek and Hebrew, and got further education in it in his two masters' degrees.)