" it is imperative that all students learn good handwashing techniques

Adult 9"-15

with large dials for controlling frequency and decibel level and membrane covered buttons silent operation of tone and right/left ear selection

Runs on 3 AA batteries (included)

Earscan 3 Audiometer - Manual SC " it is imperative thatThe Earscan 3 Audiometer is a truly portable unit weighing less than 10 oz and fits in the palm of your hand, making it perfect to travel from location to location. The Earscan 3 Manual Audiometer allows you to select test frequencies and levels to meet your requirements. Your specific settings are saved and can be changed at any time. Both manual and automatic units feature operator to patient communication (talkover) which is built in, allowing test