Koolertron(TM) Digital Sound Pressure Level Meter 30 ~ 130 dB Decibel USB Noise Measurement With SD Memory Card Able to connect to PC with USB and insert SD card,one years data memory Recording and downloading noise data (can be saved in Excel and txt format) Conformed to the IEC651 Type2 and ANSIS1.4 Type2 standards OVERe and UNDER symbol appared when the reading is over the upper limit and under the lower limit With tripod mounting screw at the back for fixing on tripod during field works