Sound Level Meter

We are offering sound level meter, nd9 it is used to calibrate the sound level meters the sound level meter calibraters has two models of nd9a, nd9b. it fits for the standards of gb/t15173, ansis1.40 class2, iec942. The frequency is 1000hz. the power supply is 1*9v 6f22 battery. the dimension is 142*47*47mm. The weight is 275g which not includes the battery. the standard delivery includes: main unit 1; carrying case type 1; instruction manual