I still use one I got in 1994. Replaced the earpieces and diaphragm a few times, but the chestpiece and tubing are original That's like a little over $3/yr. Ca

I still use one I got in 1994. Replaced the earpieces and diaphragm a few times, but the chestpiece and tubing are original That's like a little over $3/yr. Can't complain