Features
1. It is suitable for testing leaks in confined spaces and has a 420mm probe.
2. Put the transmitter DY26-T into a closed container to be tested.
3. Sense pressurized leaks, detects electrical arcing, and finds falling solenoids, valves and bearings .
4. Comes with a transmitter that emits an ultrasonic frequency to help locate leaaks that are not pressurized. Enough to emit frequencies the  detector can pick up.
5.  Detects any pressurized leaking gas, including chlorofluoro carbon(CFCs), hydrofluoro carbon(HFCs), nitrogen(Ni), carbon dioxid.

Instructions
1. Put the transmitter DY26-T into a closed container to be tested.
2. Adjust the sensitivity of the DY26-R for receiver (you can adjust the sensitivity to the maximum at the beginning), and then hold the receiver DY26-R to slowly move along the measured object and listen to the sound from the headphones.
3. The closer to the point of the leak, the louder the headphones. (At this time you can adjust the sensitivity appropriately).
4. Adjust the sensitivity of DY26A, hold DY26A slowly moving around the measured object,
5. The closer to the point of the leak, the louder the sound from the headphones.

Specification
1. Frequency Response: 40kHz +/- 2kHz
2. Operating Condition: temperature:0-40 degree Celsius
3. Relative humidity: less than 80%
4. Battery: 9V, 6F22 or equivalent
5. Size: 171x43x38mm
6. Weight: about 240g