Digital sound level meter according to EN 61672-1 Class 2 with nearly unbeatable features. In addition to the usual standard functions, the SL-451 includes a data logger and a USB interface. Its robust housing with a rubber protective frame makes the device suitable for tough use. It has a measurement range of 30 to 130 dB with an auto-range function. An integrated data logger allows for the storage of up to 32,000 measurement values, which can later be read and processed on a PC using the supplied software. This makes long-term monitoring easily achievable. With the detachable microphone and the included 3 m extension cable, measurements can also be taken in hard-to-reach locations. The software of the SL-451 allows for measurements and evaluations according to DIN 15905-5 to prevent hearing damage from high sound emissions of electroacoustic sound reinforcement systems.