The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From schabelDoesIT GbR:
This software program has a sound level meter for measuring ambient noise and a hearing test to check your hearing. 1. Sound level meter Start and finish noise measurement using Start/Stop. The highest sound level recorded is shown in dB. Please note that noise levels above 80 dB can damage your hearing. Results of this noise level check are indicative only. A physically reliable reading is not possible in this way. Please note: Precondition for the test is a microphone, which may not be supplied (f.i. iPod, 8GB) but may be bought. 2. Hearing test In a test sequence, separate sounds are produced for each ear at different frequencies and sound pressure levels which you need to confirm. This determines the lowest sound level you are able to hear. The result will be shown in a graph. This hearing test merely serves as an indication of your hearing ability. The result is not a final analysis. For a reliable hearing check-up please contact your ENT Specialist or a qualified audiologist. The results produced by this software are approximate values and of indicative nature only. No liability is accepted for any direct or indirect consequences arising through the use of this software.