Hello ,
I just want to start a new project which is an agent walking through checkpoints all around the road to mark his presence by a card (similar to an IDCard ) .
I'm into RFID system but i need some help 
What have you tried so far ?
Can you detect the presence of the RFID card ?
How far apart will the checkpoints be ?
nothing till now i want to start it this days .
yes for ex an agent have a card reader then he walk around the road ( about 300 m) where we put our card (about 5 cards)and read those card using the reader ,
the reader will store the time each round in the night .
Have you actually got an Arduino, an RFID reader and at least one card ?
Yes i have an arduino uno and rfid reader and I want to buy cards but i have no idea which type of TAGs to buy .
Where did you get the reader from ?
Can the seller provide more information ?
RFID RC522
this is the model
This site lists the supported card types RC522 reader
Did the reader not come with sample cards ?
Where did you get it from ?