Thank you for your interest in our products. For prompt service, we ask that you email us for assistance.

• Phone hours for our Support Team is 9:00AM to 1:30PM (ET), Monday through Friday, except major holidays. 877-412-3600

Note: All other hours our staff is handling customer service requests, sales support etc through email. Please eMail us for prompt service. Thank you.

• For sales: Please eMail the Sales Team at:

• To obtain a copy of an invoice: Please eMail the order number, date of order and your name to: We cannot honor these requests by phone. However, you can log into your account to print a duplicate copy of the receipt that was initially eMailed at the time of the purchase.

• To get a copy of our W9: eMail that request to: We cannot honor these requests by phone.

• For product or technical support: eMail Technical questions only, please. All other questions should be eMailed to:

• Radon results are available at www.TestProducts.com/results (inquiries concerning your radon test should be sent to:

• Fee is not charged when making payment on existing orders that have already been placed online.

To get a return call during business hours send an email to the appropriate department along with your name, phone number, reason to call & best times to call. Thanks...

Telephone support is not available for callers outside of the US at this time. Contact is only available via eMail at:

• Mailing & remittance address:

3100 Littlestown Pike

Westminster, MD 21158