The KNOWHEN® Ovulation Test is guaranteed for life for all manufacturing defects. However, prior to returning the microscope we suggest you call our Customer Service Department toll-free at 1-877-456-6943 to discuss the problem and allow our service experts to provide the proper solution. 

To exchange the KNOWHEN® Ovulation Test send $5.99 for return postage, insurance and handling. Your original receipt and packaging must accompany your returned microscope.

Return to: HiLin Life Products, Inc. 211 Warren St. Suite 211, Newark, NJ 07103 USA