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Home > Terms and Conditions


1. Privacy
Tresna does not rent, sell or otherwise forward your personal information to any third party vendors. Please see our Privacy Policy for more information about your confidentiality.

2. Service
Tresna shall provide measuring instruments and/or services for the customer upon acceptance of a customer's subscription or order. All orders are subject to our approval.

3. Delivery
Once you make a payment. Your order will be shipped out by UPS/EMS/TNT/DHL within 48 hours, and it takes 5-7 days to arrive at your doorsteps (This policy is not applicable for Custom/OEM/ODM/Wholesale measuring instruments because it takes more time to prepare for the order). We are making reasonable efforts to make every deal normal. Any delay of arrival date caused by/be subject to customs clearance delays, force majeure or other circumstances beyond Tresna' s control, we will do our best to inform you in advance.

All order up to $100 are free delivered at Order less then $100 will be charged $20 delivery fee. You may be liable to pay the possible import duties and taxes in your country, which is beyond our control.

4. Payment accept all major credit/debit cards (Visa, MasterCard, American Express, and Discover), eChecks, bank transfers, and PayPal accounts. Fraudulent credit card usage will be reported to the proper authorities.

5. Cancellation, replacement and refund

The customer can make a request of refund or replacement. offers a 60-day money back guarantee on our products. This guarantee is valid for all products except Custom/OEM/ODM/Wholesale orders.

Refunds will be made by Paypal or the method of payment used in the original purchase after we receive your return items.

Please note that you are responsible for the cost of shipping your return or replacement to us. Please email us the feedback form and to request a Return Merchandise Authorization (RMA) number. Then mail your item(s) back in their original packaging.

6. Brands & Copyright

Tresna and Guanglu are registered trademark of Guilin Guanglu Measuring Instrument Co., Ltd.

All the contents shown or listed including pictures and text at are copyright protected and may not be used, modified or copied without the written permission from us.

Tresna may modify these terms and conditions at any time and such modifications will be effective as soon as the modified terms are posted. We reserve the right to, in its sole discretion, to modify and/or explain our terms and conditions.