We have not yet callibrated the meter, so the number you can see may differ slightly from the real grid frequency by a constant small amount.

The reason why we show so many decimal places in the frequency is to ensure you can see it change. The changes (the movements of the needle) should be quite accurate.

There will be a slight delay in the signal because it takes at least two seconds to send the data over the internet.

Disclaimer: Please don't rely on our grid meter for any industrial or other applications. We can't guarantee accuracy or reliability!