All of our products come with at least a 2 year replacement warranty. Our Omnimeter II UL v.3 and Omnimeter Pulse UL v.4 both have a 10 year replacement warranty. If you are unsatisfied with your purchase for any reason, you can return it within 30 days for a full refund (this does not include return shipping expenses). Beyond the 30 day threshold, we will accept returns for up to 6 months from the date of purchase, but those returns will be subject to a 20% restocking fee. All returns are conditional on the product(s) being in good and resale-able condition. Products that don't meet these conditions will not be accepted for return. Orders returned without adequate protective packaging will not be accepted for return. Breaking the meter seal, on any of our meter models, voids their warranty and they will not be accepted for return. If your product(s) is eligible for return, please download our RMA Form, fill it out, and include it with your return.