would I need the transmitter device to leak check air conditioning coils etc?

This is a simple tool to hear the whistling of high pressure air going through a small opening. The high frequency pitch is picked up by the microphone. You won't need anything else to operate this. I prefer to use my own headphones instead of the ones in the kit, but that is a personal preference. It also has a sound bar so you can see it, too. You don't need to listen, although I find it helpful.

if I pressurize my underground pool skimmer line with air, would this be practical for locating a leak?

I don't believe it will help in this application. To detect the leak, you must be able to see the line and place the unit relatively close to the hose. So for your application, you would need to expose your lines. If your pool skimmer lines are visible, it is easier to inject a dye, such as a UV dye, and shine a UV lamp to find it. If your lines are not visible then you would need to dig up the line to look for the leak. When I had an underground leak, I hired a person to find it for me. It was worth the money for the one time repair.

Is good for bearing friction detection?

Hello and thank you for your question. Yes, with the optional metal contact probe (711-703-G1) Whisper can detect malfunctions in certain mechanical components, bearings included! The contact probe is included with the version that comes with the accessory kit (711-203-G1). Simply screw the metal contact probe to the tip of Whisper and touch it to the suspected mechanical component. For the best experience, use a pair of headphones to utilize Whisper's heterodyne feature. Properly functioning machinery sounds smooth and clear, whereas malfunctioning machinery may produce grinding, scratching, or other irregular noises.

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🔍 Whisper your leaks away with pinpoint ultrasonic power!

READY OUT OF THE BOX - Includes headphones, rubber probe, batteries, and rugged carrying case for instant deployment.
ULTRASONIC PRECISION - Detects pressure and vacuum leaks across all gases—even in noisy environments.
LASER GUIDED ACCURACY - Integrated laser pointer zeroes in on leaks fast, saving you time on every job.
US BASED SUPPORT QUALITY - Proudly made in the USA with expert technician support via email and phone.
EXCLUSIVE NITROGEN DETECTION - Only tech on the market that finds pressurized nitrogen leaks effortlessly.

The INFICON Whisper Ultrasonic Leak Detector (model 711-202-G1) is a compact, battery-powered tool designed to detect leaks in pressurized and vacuum gas systems using advanced ultrasonic technology. It features a laser pointer for precise leak location, works reliably in noisy environments, and uniquely detects pressurized nitrogen leaks. The package includes headphones, a rubber extension probe, two D-cell alkaline batteries, and a rugged carrying case. Made in the USA with dedicated technical support, it’s the professional’s choice for efficient, accurate leak detection.

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Manufacturer	Inficon
Part number	711-202-G1
Item Weight	1.36 kg
Product Dimensions	12.7 x 30.48 x 40.64 cm; 1.36 kg
Item model number	711-202-G1
Colour	Grey, White
Style	Compact
Power source type	Battery Powered
Item Package Quantity	1
Included components	Whisper, Headphones, Rubber extension probe, 2 D-size alkaline batteries, case
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline

INFICON Whisper, Ultrasonic Leak Detector, 711-202-G1

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