SubSurface Instruments LD-18 Operation Manual page 26

<Conditions that affect water leak detection>
1. Scale of water leak (size of water leak hole in the pipe)
2. Water pressure
3. Soil quality
4. Pipe material grade
5. Pavement type
6. Hydrous soil conditions
7. Sound of consumption water at the house
8. Wastewater inflow sound and dropping sound
9. Sound of air-conditioners
10. Automotive vehicles traveling sound (friction sound)
11. Wind noise
12. Sound from transformers and automatic vending machines
13. Sounds from electricity, telephone cables, motors and pumps
14. Water leakage in a pool condition
(*There are cases where water leak detector is hard depending on conditions stated above.)
WARNING
When a headphone is used for hearing water leak sound during use of this detector, it is hard
to hear the ambient sound. Be cautious.
CAUTION
Be careful not to cause damage to your ears at the time of sound hearing with a headphone.
6. Method for water leak detection
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[Hardware]