Guernsey·Testing Services in American Samoa

An independent third-party research and testing organization established under Chinese laws and regulations, recognized as a high-tech enterprise in China.

Our laboratories hold CMA (China Metrology Accreditation), CNAS (China National Accreditation Service for Conformity Assessment) and ISO quality management system certification. Reports are legally valid within China.

Our laboratories hold CMA, CNAS and ISO certificates. Test reports can be used in a variety of business scenarios. To confirm the applicability of your items, please contact customer service.

No. Items listed are representative services only. Coverage spans materials, chemicals, food, pharmaceuticals, environment, aerospace, defense and other sectors. Please contact customer service to confirm specific capabilities.

Yes. Aerospace- and defense-related testing services are available. Customized testing programs are provided for advanced manufacturing and defense research, under strict confidentiality agreements.

Routine testing generally takes 7-15 working days, depending on item complexity, sample quantity and applicable standards.

Yes. Urgent projects can be expedited by arrangement. Please confirm expedited timelines and fees with our engineers.

Yes. You may contact your dedicated engineer or customer service at any time for progress updates.

Delays may occur due to public holidays, equipment calibration or sample retesting. Engineers will communicate in advance.

Fees vary with test items, applicable standards, sample quantity and complexity. Submit your requirements to receive a customized quotation from our engineers.

Typically testing and report issuance. Paper report mailing or on-site sampling may incur additional charges, subject to the quotation.

Yes. Official VAT invoices are available; corporate clients may use them for accounting and reimbursement.

Payment terms are negotiable — typically prepayment or installment payment as agreed in the contract.

Sample delivery by courier is supported. On-site sampling is also available in mainland China.

Requirements differ by test item, including form, quantity and packaging. Please confirm quantities and preparation requirements with our engineers before shipping.

Sample retention and disposal rules are described in the service terms. If you need samples returned, please confirm with engineers before commissioning.

Yes. International sample shipments are accepted. Please confirm customs declaration, packaging requirements and special handling with engineers before shipping.

Report interpretation is available. Engineers explain the meaning of test data, comparisons against standard limits, and conclusions one-on-one.

Our laboratories hold CMA and CNAS certificates. Reports issued in China can be used for bidding, market entry and similar business purposes. Please confirm applicability with engineers in advance.

Yes. Both Chinese and English reports are available to support international business.

Each report carries a QR code for online verification. You may also trace it via the report inquiry portal on the official website using the report number.

Via the online consultation portal on the official website, the consultation hotline +86-400-640-9567, or email 010@yjsyi.com. Engineers are online 8:00-20:00 (Beijing time).

Yes. The online consultation portal is open around the clock. Requests are given priority on the next business day.

A confidentiality agreement is signed with every client. Testing data and client privacy are strictly protected. Our laboratories hold an AAA integrity certification.

Please raise objections within the specified period after receiving the report. Engineers will assist with data review and negotiate a resolution.

Yes. Dedicated food testing and pharmaceutical testing laboratories provide food composition analysis, pharmaceutical quality control and contaminant testing.

Yes. The environmental laboratory provides water quality, soil, exhaust gas and noise testing.

Yes. Composition analysis is one of our core services, characterizing unknown substances qualitatively and quantitatively using multi-instrument techniques.