Supply Of Bearing And Machine Noise Kit (Electronic Stethoscope). Technical Details: Frequency Range:30 Hz 15 K Hz, Operating Temperature: 10 To +45 Degrees C, Output Volume: Adjustable In 15 Levels, Display: Lcd (Black &White), Sound Volume: Up & Down, Battery Low Signal: Yes, Case Contents: Instrument, Headset, Probe: 70 Mm And 300 Mm, 2 X Aa Alkaline Battery, Instructions Manual. Make/Model: Skf Tkst11 Or Equivalent. Special Conditions 1) Calibration Certificate By Any Approved Gov. La