NKTECH NK-D2 USB Data Logging Digital LCD Sound Meter Noise Level Auto Ranging 30 – 130 dB Decibel Frequency 31.5Hz-8.5kHz High Accuracy +1.5dB 32000 Readings Backlight Tester

Quality piece - logging software took some doing to get working, but for the money, you cannot beat this for logging sound level for as long as two days.

Perfect device. I just wish it had a broader range. It tops out around 130 + decibels and it appears there are a lot of things louder than that!

The battery compartment was defective and I could therefore not get all the batteries into the product. I therefore cannot properly evaluate it.