Long-term experience HQ W9-20195

I have / had the device (or its predecessor, if it was developed) for a long time in this project - including a longer time in probably ineffective state. The underside is made of a plastic strip on the contacts are guided on both sides, between which flows when wet, the current and the alarm. The unit is in a stand. This must be level on the floor and then floats the contact strips a few millimeters above the floor. This solution is quite shaky stand and the unit tipped frequently to or leaning diagonally on the washing machine. As the water would need to be already 3 cm high before the contacts are wet. On ear pretty loud, but pretty quiet to hear behind the cellar door.
In the long-term experience found that declining battery power will not be warned. Something today have consistently all smoke detectors and remember the exchange.
After a battery change, the device no longer responded to the humidity test. It found that the plastic strip with the contacts corroded and had become brittle.
Could not be more correct! Has for the price a few years doing his duty and much more you can not expect - Still out of the experience is my new solution: device with external wired sensor. Device hangs on the wall, wired sensor located on the floor and can not fall too! happy