Aside from my review, look around for others (wish I had) and you'll see the broad frustration of not being able to adjust the sensitivity or duration. Much as with many others too however, mine lastly only around 6 months until the stepper motor lost its datum so it now erratically scans or mainly remains fixed to the far left. In short, given a price that would make you think quality ... it's ... not.
Having read the reviews for similar products, this one seems fine. It is quite well made and includes what must be necessary rubber O-rings. It may not be the cheapest but I'd be concerned about buying cheaper!