This is a demo of what it'll look like when it's done.

STEP 1 - ON SCAN SET GLOBAL VARIABLE

• Create a new profile in Tasker with the NFC Tag event
• Accept it as it is or restrict to a certain tag if you want
• In the Task use the Variable Set action to set %NfcPresent to 1

STEP 2 - CHECK IF NFC TAG IS STILL PRESENT

• Add an NFC Tag action to the task
• Add an If action and set the condition to %nfc_present matches true
• Add an End If action to close the If

STEP 3 - KEEP SCANNING IF STILL PRESENT

• Add a 1 Second Wait action inside the If
• Set a Label on the NFC Tag action above: scan
• Add a Goto action inside the If and make it go to the Action Label scan

STEP 4 - CLEAR GLOBAL VARIABLE IF NO LONGER PRESENT

• At the end of the Task add a Variable Clear action and clear the %NfcPresent variable
• Back out of the task and apply your settings with the tick icon on the top right

STEP 5 - TEST VARIABLE

• If you now go to the VARS tab and scan a card, you'll see that the %NfcPresent variable changes to 1. If you remove the card it'll change to not being set.

STEP 6 - EXAMPLE PROFILE WITH THE NFC PRESENT STATE

• Create a new Profile with the Variable Value state
• Set the condition to %NfcPresent Is Set
• In the task do whatever you want to happen when the NFC tag is near your phone. In this example I created a notification
• Add an exit task and also do whatever you like there. In this example I cancelled the notification.

Now, when an NFC tag is near phone the notification will come up and when the tag goes away, the notification will also go away .