... (F type) & multi-sound pressure level (S type) 3. Built-in temperature, humidity sensors can measure environmental temperature and ... 84dB, 94dB, 104dB94dBStandard deviation for SPL Smaller than ±0.3 dBSmaller than ±0.5 dBFrequency(Hz)1000Hz1 000Hz, 500Hz, ... ±1 %Distortion(THD)≤1 %Power Supplylithium recharge Battery(3.6V)Display122×32 LCDDisplay interface Nominal sound pressure level and frequency ...