30 calendar days from delivery for eligible standard products.
Global return and exchange policy
Return rules for industrial sensor products
This policy is designed for DZKJ air quality, gas, oxygen, humidity, temperature, and flow sensor products sold for OEM, distributor, laboratory, building, and industrial projects. Local mandatory consumer rights apply where they provide stronger protection.
New, unused, uninstalled products in original packaging.
Confirmed defects or wrong shipments are repaired, exchanged, or refunded.
1. Products eligible for return or exchange
Standard catalog products may be returned or exchanged within 30 calendar days after delivery when the product is new, unused, uninstalled, clean, complete, and returned with original packaging, labels, accessories, calibration papers, manuals, and any included documents.
Before sending a product back, request an RMA number from DZKJ. A return shipped without RMA approval may be delayed or refused.
2. Products not eligible for buyer-remorse return
Because sensors can be affected by installation, calibration, contamination, and operating environment, the following products are not accepted for buyer-remorse return: custom cable length or custom output products, project-specific calibration, private-label or marked products, products installed in equipment, powered or used products, products exposed to gas, liquid, dust, chemicals, heat, humidity, pressure, ESD, or contamination, and products damaged by misuse, incorrect wiring, incorrect media, or unauthorized repair.
3. Defective, damaged, or incorrect products
If an item arrives damaged, incorrect, incomplete, or appears defective on arrival, contact DZKJ within 7 calendar days of delivery and provide order details, photos or video, product label, installation status, test conditions, and a short fault description. After inspection, DZKJ may provide repair, replacement, exchange, credit, or refund according to the confirmed issue.
DZKJ covers reasonable return shipping for confirmed defects, shipment damage caused before delivery, or wrong-item shipments. For non-defective returns, the customer is responsible for return freight, customs, taxes, duties, brokerage, insurance, and safe packaging.
4. Inspection and refund timing
Returned products are inspected after arrival. Refunds or credits are normally processed within 10 business days after the returned product passes inspection. Original outbound shipping, import costs, duties, taxes, and bank fees are not refundable unless the return is caused by a DZKJ error or confirmed product defect.
5. Return shipping, fees, and refund amount
Return method is by mail only after RMA approval. For buyer-remorse returns of eligible standard products, the customer is responsible for return freight, customs, duties, taxes, brokerage, insurance, bank charges, and safe packaging. DZKJ does not charge an additional restocking fee for approved standard catalog returns, but original outbound shipping, import costs, duties, taxes, and bank fees are not refundable unless the return is caused by a DZKJ error or a confirmed product defect.
For confirmed defective products, wrong-item shipments, or shipping damage caused before delivery, DZKJ covers reasonable return shipping or provides an agreed repair, replacement, exchange, credit, or refund after inspection.
6. Google Merchant return and refund summary
This Return & Refund Policy is linked in the footer of every page and is intended to stay consistent with the return details submitted to Google Merchant Center and Google Search. Customers must request RMA approval before returning a product. Eligible standard products can be returned within 30 calendar days from delivery. Products must be new, unused, uninstalled, clean, complete, and in original packaging unless the return is for a confirmed defect, wrong item, or shipping damage. Refunds or credits are normally processed within 10 business days after the returned product passes inspection.
7. EU and local consumer rights
For eligible consumer purchases in the European Union and other jurisdictions with mandatory distance-selling rights, statutory withdrawal or cancellation rights remain available where required by local law. For EU consumer distance purchases, the withdrawal period is normally 14 days from delivery. The customer normally pays return postage during the withdrawal period unless local law or DZKJ states otherwise. Goods made to order or clearly personalized may be excluded from withdrawal rights where allowed by law.
8. How to request an RMA
Email or message DZKJ with the order number, model, quantity, serial or batch number if available, delivery date, reason for return, and product photos. DZKJ will confirm whether the product is eligible and provide return instructions.