72-8690A 72-8695A 72-8700A 72-8335A72-8XXXA Thank you for purchasing our product. In order to ensure correct installation, operation and optimum performance of this product please read this manual in detail and keep for future reference. This instrument is produced under strict quality control. All parts go through screening and ageing, and a series of performance testing, environmental testing and safety testing. In order to guarantee safe use, and the best working performance, working environment guidelines must be followed.