dht44 rht05 sensor

Hi
I have an Arduino mega 2560
I am looking to buy humidity temperature sensor.
I have a budget of £20.
The sensor has to be in the case and robust and I need to add about 12ft of cable.
This is what I've come up with so far.
I have been looking at the dht44 rht05 for what I've seen there is an Arduino library.
There also seems to be a 1pcs am2305 is this the newer version and will the same Arduino library work could anybody explain to me what 1pcs 2pcs and 3pcs mean.
My only concern with these sensors is the filter it looks like it could get blocked up easily. And as anybody ever you with sensor.
If anybody has got any suggestions it would be a great help.
Thanks Paul

“1 pcs 2pcs and 3pcs” => How many of them do you need? 1, 2 or 3?

The DHT22 is the most accurate in that family. 12 feet may require TP-cable … or worst case shielded cable
The sensor isnt very suitable for outdoor, condensing conditions.