Sound Level Calibrator for 1/2" Diameter Microphones, +/-0.5dB Accuracy R8090

Sound Level Calibrator, Output Sound Pressure 114 dB, Frequency Accuracy +/-4 Percent, Frequency Source 1,000 Hz, Distortion +/-0.5 dB, Compatible with Brand Universal, Compatible with Manufacturer Model Number R8090, Output Sound Accuracy +/-0.5 dB, Battery Chemistry Alkaline, Overall Diameter 2 in, Batteries Included Yes, Battery Size 9V, Battery Voltage 9V, Overall Height 4 11/16 in, Minimum Operating Temperature 32 Degrees F, Maximum Operating Temperature 104 Degrees F