The sound level meter is divided into two models: AS-156A (resolution 0.1dB, accuracy ±2dB) and AS-156B (resolution 0.1dB, accuracy ±1dB); applied to machine noise, vehicle noise, architectural acoustics, environment Noise, electro-acoustic measurement.

* With DC output 1 0 mV/dB.
* Can store 30 sets of measurement data and measurement status.
* Three weighting "A"/"C"/"F" selections and time weighting "fast and slow" selections.
* Four measurement parameters: Lp common sound level measurement, Leq equivalent continuous A sound level measurement, Lmax maximum sound level measurement, LN statistical sound level measurement.
* Equipped with "alarm value setting", "output", "automatic shutdown and manual shutdown" and other functions.
* Use USB data line output to communicate with PC.
* Provide Bluetooth data output option.