All Help Topics
Changing or Canceling Order
How to change or cancel an order you have placed with us
Order Status and Tracking
How to find out the status of your order and obtain the tracking associated with it
Request an Invoice
How to obtain an invoice from any previous purchases made with us.
Items Out of Stock
Why items are out of stock or on backorder and what it means
E-Mail Notifications
Order related notifications you may receive from us via e-mail
General Shipping Information
General shipping policies and procedures for all shipments
Shipping Issues
Shipping policies including damaged items, missing items, and undeliverable or refused packages
Return Policy and Instructions
Terahertz Store return policies and procedures
Damaged Items
Information about what do when you receive a damaged product
Defective Items
Information about what do when you receive a defective product
Warranty
All OEM products are sold with the full manufacturer's warrantyplease consult the information enclosed with your packaging for terms and conditions.
Account Info
Learn how to create an account and what the benefits of having one are.
Security
Checkout Security and Fraud Prevention
Terms Account
Setting up a terms account for wholesale or bulk purchases
Wholesale or Bulk Purchases
How to apply for a wholesale account and receive bulk discounts
Order Processing
Processing timeframes, placing an order, and order processing notifications
Payment Methods
Review payment options available at checkout
Phone Orders
How to place an order over the phone
Sales Tax and Tax Exempt
Sales tax, tax exempt, international taxes and when they are applicable
Sales Policies
Complete list of store policies and procedures
Clearance / Discounts
Details regarding items put on clearance and current coupons or promotions
Contact Us
Click here if you have a question on a product we sell, a general order related question or just need to contact us.
Product Support
Help with technical product questions, warranty information and part replacement.
Holiday Shipping & Hours
Please be aware of our Holiday operating times and shipping windows
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Sales Tax and Tax Exempt
Illinois Tax
Orders placed with a shipping address within the state of Illinois will be subject to Illinois state tax of 10%.
Tax Exempt
If you are an Illinois business or government agency and feel that you are tax exempt, please fax your contact information and a copy of your tax-exempt letter to (847) 991-7189. Once we receive and file your tax-exempt letter, we will e-mail you confirming that you are ready to make your tax-exempt purchase.