Hot spot:\n1.\taccuracy meet astm standard\n2.\tfast testing to get the data within one second\n3.\tcan save 8 sets latest testing data\n4.\tsmall size and 70g weight for easy carry\n5.\tcomply with cmdcas ce0197 iso9001&13485 fda and en46001 certificates. \n6.\ttesting parts are the ear canal without much influence from environment\n7.\teco-friendly without any pollution and safe testing\n8.\tbest design and quality control\n