E-era electronic co co2 MQ-2 3 4 5 6 7 8 9 135 gas sensor module china Methane Hydrogen Detection smoke sensors

the questions which our partner ask most
Q1. How about the quality?
A: We tested 100% before we ship out.We offer 90- 180days quality assurance.
Q2. What is your terms of payment?
A: Order below 10000USD is T/T 100% in advance .
B:Order over 10000USD T/T 50% as deposit to arrange goods.and rest 50% before delivery. 
C:Sample order we can support  

PAYPAL , WERTERN UNION,UnionPay and Alipay.
Q3. What is your terms of delivery?
A: EXW, FOB, CFR, CIF.(defaults EXW for all quotation)
Q4. How about your lead time?
A: There are no lead time for in-stock products.We can ship out within 1-3days after you confirmed the payment.

B:Customized product,we will ship out within our professional invoice show.

Q5. What is your sample policy?
A: Most of products,we can offer free samples;you just need pay the shipping cost.

Q6:Can we ask support if get trouble?

Sure, if there is any quality problems or questions;we could offer technical support or return service .
Q7. Can we return  back the goods?
A: Sure, if you are not satisfied with the quality;you can send the original box back to exchange or refund.You pay the return ship cost.We pay the back cost.

B:If you get wrong item and the mistake made by yourself;we can offer return too.But you should pay the ship cost both.And you can ask us to exchange or refund.