Sound Level Meter

Display : 14mm (0.55＂) LCD with backlight
Parameters measured : Lp, Lmax, Leq , LN.
Measurement range : 
Lp : 30~130dB (A);  35~130dB (C);  35~130 dB (F)
Leq: 30-130dB (10s, 1min, 5min, 10min, 15min, 30min, 1hour, 8hour, 24hour)
LN : 0-100%
Resolution : 0.1 dB
Accuracy: ± 1dB
Frequency weighting:'A', 'C', 'F' (Flat)
Time weighting : Fast (125ms); Slow (1 second)
Microphone:1/2 inch electret condenser type
Memory: 30 groups with measuring conditions
Built in calibration signal : 94dB at 1kHz (sinusoidal)
Frequency range : 20 to 12,500 Hz
Alarm value set : 30-130 dB
Alarm output : LED and optional relay contact (NC)
PC interface : RS232C 
Low battery indication
Power supply : 4x1.5v AAA (UM-4 battery)