We are offering sound level meter sl 130-b. This unit was designed according to following standards: ----a. International electrician committee standard: iec pub 651 type2 ----b. Us national standard: ansi s1.4 type2 *measuring range: ----30130 dba ----35130 dbc*accuracy: 1.5 db *digit & resolution: 5 & 0.1 db *frequency response: 31.5hz 8.5khz *measuring level: 30130, 4090, 50100, 60110, 80130 * frequency weighting characteristic: a & c * time weighting: fastslow *sampling rate: 2timessecond *microphone12 inch polarization capacitance microphone *acdc output *max reading *pwm output *calenda *4700 data store *usb computer interface *analysis software *overload indication: over under *automatic backlight *low battery indication *auto power off