Dear Sir/ Madam,It is nice to write to you. This is yousef from Jordan. I would like to buy lung function tester spirometers and oximeters.May I know more information about product such as:Certification,EINECS No.,Type,What are your payment terms for new customers?I hope we can cooperate in the near future.Thank you for your timeyousefalnoor my ****yousef8788 Show More