Ideal for monitoring of noise levels in buildings offices production plants etc the sl 130 has an adjustable alarm function so it can adhere to the legal level checks and if necessary protective measures are taken the sl 130 is also ideally suited as a control instrument at lectures or performances when sound level of the lecture is optimal the leds are green if you go over or under the desired sound level then they either light up or blink red and signal to the lecturer to adjust the