Digital pH meters; Dog whistles; Electronic warning bells; Electronic warning horn; Infrared thermometers, not for medical purposes; Personal security alarms; Scientific measuring instruments, namely, conductivity meters; Soil sampling equipment, namely, tubular liners or tubular sleeves; Sound alarms; Sound amplifiers; Thermometers not for medical purposes; Time clocks; Time recording apparatus; Timer that may be attached to a prescription vial cap for reminding persons to take medicine; Tir...