Discount is for first-time email sign-ups ONLY. Offer valid for one-time use on online purchases. Applies to a maximum quantity of 1 per SKU. Cannot be combined with any other coupons, discounts, offers, or promotions. Subject to product availability, no rain checks issued. Sales tax, shipping and handling, gift cards, and previous purchases do not qualify towards this offer. Void if altered, copied, transferred, or sold. Discount expires 45 days after subscribing. Offer subject to change at any time. Kestrel Instruments reserves the right to end this promotion at any time without warning. All terms and conditions apply.