Ideal for monitoring noise levels in buildings, offices, production facilities, etc. The SL-130 features an adjustable alarm function, allowing for compliance with legal noise levels to be checked and protective measures to be taken if necessary. The SL-130 is also perfect as a control instrument during speeches or presentations. When the speaking volume is optimal, the LEDs light up green. If the desired volume is exceeded or not reached, they light up or blink red, signaling the speaker to adjust the volume. The alarm is indicated visually by super-bright LEDs that are visible up to 30 meters or through an analog switching output.