1.Accurate—meet ASTM Standard
2.Fast—get the data within one second
3.Memory—saving your testing data
4.Easy carry—weight is only about 70g
5.Reliable—comply with CMDCAS CE0197 ISO9001&13485 FDA and EN46001 certificates.
6.Economic—we are the manufacturer of this item can offer best price
7.Comfortable—smooth material and fit size can comply with any ears
8.Quality—we design and produce this item with powerful quality control