Comes equipped with the tools you need to conveniently calibrate your sound level meter in the fieldSound level meter meets IEC 61672-1 Class 2 requirements, records up to 64,000 data points (1MB), and features 60dB dynamic space in each rangeSound level meter features real-time clock and calendar, fast/slow time weighing, min/max function, USB interface, backlit LCD display, and a tripod mount design for long-term monitoringProfessional grade, injection-molded hard plastic case with laser-etched, custom foam interior specifically designed for the included instrumentsSound calibrator generates a stable acoustic signal at a controlled frequency and amplitude to verify the accuracy of your sound level meterSound calibrator complies with IEC 942 Class 2 standardsIncludes: R8080 Sound level meter/data logger (with 4 AAA batteries), R8090 Sound level calibrator (with 9V battery), R8888 Deluxe hard carrying case, Windshield ball