for sale Miniature Ascent Rate Alarm

I’ve got two Miniature Ascent Rate Alarms for sale. Both were used only once. Unfortunately I’ve got tinnitus and can’t hear the alarm reliably. New cost $45 - $15 + $5.20 USPS postage.

here is a link to the product:

http://divemar.com/Divemar/docs/mara.html