Delivery Scope

Testo Sensor LD pro leak detector with sound funnel and integrated camera, Transport case, Sound-proof headphones, Directional tube and tip, Mains adapter, Spiral cable for connecting the ultrasonic sensor, length 2 m (extended)

Ultrasonic Leak Detector with Integrated Camera - Testo Sensor LD pro
Model No: Testo Sensor LD pro Part No: 8900 0501

The testo Sensor LD pro ultrasonic detector kit impresses thanks to its high-recision sensor technology and improved support in the detection of leaks (e.g. in compressed air, gas, steam and vacuum systems, refrigeration systems, door seals). The leak can be more accurately localized thanks to the integrated laser pointer which acts as a sighter

  1. Improved localization of leaks thanks to sound funnel
  2. Robustness and a low weight ensure non-tiring use in industrial environments
  3. Continuous operation for 9 hrs
  4. Easy operation via touchscreen
  5. With integrated camera: display and storage of leaks in the image
  6. Direct display of the leakage rate in l/min and the costs in EUR
  7. Transmission of leakage data to the PC via USB
  8. Easy creation of a report in accordance with ISO 50001 with the Testo Leak Software


The testo Sensor LD pro ultrasonic detector kit, even the smallest leaks, which are not audible to the human ear and not visible due to their size, can already be localized from several metres away. The testo Sensor LD pro converts the inaudible ultrasound into audible frequencies.

These sounds can be perceived even in noisy environments with the sound-proof headphones that are comfortable to wear.

The testo Sensor LD pro ultrasonic detector kit impresses thanks to its high-precision sensor technology and improved support in the detection of leaks (e.g. in compressed air, gas, steam and vacuum systems, refrigeration systems, door seals). The leak can be more accurately localized thanks to the integrated laser pointer which acts as a sighter. The leakage data can be transmitted to the Testo Leak Software via a USB interface. Once the data have been exported to the software, clear reports can be created for documenting the leaks that have been found.

Saved leakage data are exported to the Testo Leak Software for reporting using a USB stick. Export to the Testo Leak Software means the following leakage data are
available for processing:

  1. Image of the leak location
  2. Date/time
  3. Company name/department/machine
  4. Size of the leak in litres/min (unit adjustable)
  5. Costs of the leak per year in EUR (currency adjustable)
Working frequency 40 kHz ±2 kHz
Connections 3.5 mm jack plug for headphones, mains unit socket for connecting an external charger
Laser Wavelength: 645 to 660 nm Output power: < 1 mW (laser class 2)
Display 3.5" touchscreen
Interface USB interface
Data logger 2 GB SD memory card
Operating time 9 hrs in continuous operation
Charging time Approx. 4 hrs (internal Li-ion rechargeable batteries)
Operating temperature 0 to 50°C
Storage temperature -10 to +50°C
Standard Meets the requirements for class 1 instruments of the “Standard Test Method for Leaks Using Ultrasonics” standard (ASTM Int. - E1002-05)
EMC DIN EN 61326
Auto level Automatically adjusts sensitivity to the surroundings and reliably blocks out ambient sounds
Sensitivity Min.: 0.1 l/min at 6 bar, 5m distance, approx. 1 EUR/year compressed air costs

Delivery Scope

Testo Sensor LD leak detector for compressed air systems incl. transport case, sound-proof headphones, directional tube with tip, mains plug unit, sound funnel

Leak-Detector - Testo Sensor LD
Model No: Testo Sensor LD Part No: 8800 0301

Testo Sensor LD leak detector stands out thanks to its highly accurate sensor technology and improved support in the detection of leaks (e.g. in compressed air, gas, steam and vacuum systems, refrigeration systems, door seals). With the help of an integrated laser pointer which acts as a sighter, the leak can be more accurately localized

  1. Robustness and a low weight ensure non-tiring use in industrial surroundings
  2. Improved detection of leaks thanks to sound funnel
  3. Modern high-capacity Lithium ion rechargeable battery
  4. Easy operation via membrane keypad


Gases escaping from leaks in pipe systems (e.g. corrosion, untight screw connections etc.) cause noises in the ultrasonic range.

With the testo Sensor LD, even the smallest leaks, which are not audible for the human ear, and due to their size are not visible, can already be localized from several metres away.

The testo Sensor LD converts the inaudible ultrasound into audible frequencies. These sounds can be perceived even in loud surroundings with the comfortably worn, sound-proof headphones.

Working frequency 40 kHz +/- 2 KHz
Connections 3.5 mm phone jack for headphones Mains unit port for connecting an external charger
Laser Wavelength: 645 to 660 nm Output: < 1 mW (laser class 2)
Operating time 10 hrs
Charge time approx. 1.5 h
Operating temperature 0 to 40 °C
Storage temperature -10 °C to +50°C
Standard Corresponds to the requirements of Class 1 instruments of the "Standard Test Method for leaks using Ultrasonic" (ASTM Int. - E1002-05)
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