The principle of our Sonic Leak Detector is to pick up any sound with a frequency above that which we can hear, 15 KHz up to 200 KHz. This a wide range made possible by using a sophisticated microphone (most manufacturers only listen to the frequencies around 40 KHz). However, if the leak is very small there is so little sound emitted that it can not be detected.
NB Because our Sonic Leak Detector has such a wide frequency range it makes a very good bat detector, picking up any species of bat because it does not need to be "tuned" to any particular frequency.
Although the Sonic Leak Detector comes with "hard-hat" type headphones but any set of headphones or earphones will do if they have a 3.5mm jack, mono or stereo. For noisy environments you can use DJ type headphones of the style that have large soft ear pads that fit completely over the ears and exclude any extraneous noise.
ABS Classification Society Manufacturing Process Approved
ISO 9001:2008 Certification Number GB13487
IIMS Corporate Membership Number C508
NCAGE Number U0B22
NFPA Membership Number 2800960
FPA Membership Number 27135