Ear lobes are suppose to be accurate too. Your tongue would be good.
It comes down to the delay from your heart to the vein you are jabbing. The quicker it is the more accurate
Google alternate site testing for info
Ear lobes are suppose to be accurate too. Your tongue would be good.
It comes down to the delay from your heart to the vein you are jabbing. The quicker it is the more accurate
Google alternate site testing for info