I have owned this tool for approximately two years. It manually locks an inward opening door. Ideal for travelling, students or anywhere that you would want privacy and security and there is likely to be multiple copies of the door key in circulation. I am on the road most weeks and have been walked in on in several hotel rooms by people with duplicate keys. I did some research and came across portable door locks.
It will not stop a determined attacker, but that is not what it is made for. It stops someone sneaking into your room using a duplicate key or bypassing the lock. A lot of hotel rooms have security chains, but there are videos on the web showing how these can easily be defeated. It also works on doors with no locks, aslong as there is a recess in the door jam where the door catch fits you can use it.
I originally had a similar one to this that I lost. When I went to replace it they had stopped production. I tried having tried several other designs but was never happy, then came across the Calslock one. At the time I purchased they only appeared to be sold on eBay, which worried me, but having purchased one there was very good service and it is an excellent product. (Still on eBay and cheaper than their home page!)
What makes this a cool tool compared to other portable door locks is a combination of things:
– It is a very good design, slim enough to fit doors that have a very tight fit.
– Easy to operate quickly if you need to get out in an emergency.
– Very adjustable from the thinnest cheapest door to thick heavy fire doors, I have yet to come across a door that is outside it’s adjustment range.
– It is very simple, only two large parts so no small fiddly bits to lose or to go wrong.
– Finally it is cheap, only $9.95, including free postage in USA on eBay or $12.95 direct.
I have no affiliation with Calslock, but whole heartedly recommend their product.