GM1357 Portable 2.1" LCD Digital Sound Level Meter (4 x AA)
Color: Grey - Plastic case material - 2.1" LCD display - Measuring level: 30~130dBA 35~130dBC - Accuracy: +/- 1.5dB - 5 digits display - Resolution: 0.1dB - Frequency range: 31.5Hz to 8.5KHz - Level range: 30-130 40-90 50-100 60-110 80-130 - Frequency weighting: A (imitating human ear) / B (machinery noise) - Time weight: Fast / Slow - Sampling rate: 2 times per second - 1/2 inch Electret Condenser Microphone - Easy operation - Powered by 4 x AA batteries (not included) or can use external DC 6V power supply - Comes with English user manual