Testo 0554 0452 Sound Level Calibrator, ±0.5 dB Accuracy, 94 dB, 114 dB Output, 1/2 in, 1 in Microphone

Sound level calibrator, adapter ring for 1/2-inch microphones, carry case, instructions. Testo Sound Level Calibrator. For testing and adjusting sound level measurement equipment LED display for function and battery status 2 levels can be set Suitable for 1/2-inch and 1-inch microphones