[QUICKLY MONITOR NOISE]Electronic Stethoscope can quickly monitor noise for the machines,autos,ships,aircraft and other mechanical equipment, accurate pinpoints noise and location of engine bad bearings,bushingsdirty fuel injectors,wind and air leaks,noisy valves and filters. [PRINCIPLE]Automotive noise detector,when gas or liquid adopts a pore leak, there will be a high-frequency component that can detect leaked Spoiler scanning the nearby area, through earphones that can hear leaks rapids or instructions. [ADJUDT VOLUME CONTROL]Ultrasonic leak detector & transmitter,earphone pick-up sound loudness can be controlled by adjusting its volume control; Consists IC circuit and transistor, small size and light weight. Measurement & Analysis Instruments, Frequency: 100Hz~10KHz, Working Temperature: -10°C ~ 55°C, Ambient Noise Permitted:100Db. [LED INDICATE]Ultrasonic detector has LED light indicate the strength of signal of the active channel, user-friendly and unsurpassed, Battery powered and easy to use. [IT CAN'T DETECT WATER LEAKAGE IN YOUR HOME PIPE]The Leak Detector, due to the household pipe is generally a low voltage system, the ultrasonic is unable to detect water leakage. The Automotive Stethoscope Model EM410 , the pick-up sound loudness can be controlled by adjusting its volume control. Adjustable pick-up loudness control. Headset combined with ear padding to cut out background noises. Strong probe body, black ABS molding. Colour:black Material:plastic Package Contents: 1 x Stethoscope unit 1 x Headphones 2 x probe Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.