One of the struggles we have had with NFC devices is their varying degree of strength in readers and devices.  Now we can put a quantitative number to how bad they are.  These field meters are tuned to detect any standing NFC field.  They will display a value of 1/10vm or 1mH (megaHammy). 

They come in 4 different colors (Red, Orange, Blue, Green) that will be selected at random. (if you put in your order notes prefference i will do my best to accomodate).

I cannot guarantee accuracy.  But i can guarantee that the meters are accurate to themselves.  Meaning each meter will display the same value across each other. If in the future i can get my hands on more precise NFC field testing equipment i can zero these in more and will update with future version releases.

*Note* 
These require a CR2032 that will not be included due to shipping regulations.