Note: For most of the product from Elitech you purchase that includes an ISO verification certificate, we need to send the product to a third-party ISO agency for verification, which will prolong the overall logistics process by 1-3 weeks. If you have stringent needs regarding the delivery time, please be careful to purchase products that include ISO verification certificates. We'd like to remind the customers who urgently need our products that all our loggers also come with a calibration certificate from the factory.