Drop your Nute Meter? Shatter the electrode? It happens. Replace the electrode and carry on with your grow. These electrodes are built to be affordable, so you don't need to replace the whole unit when you have a clumsy day.
To replace: Unscrew the gray nut on your Nute Meter. Remove the gray nut. Pull the electrode straight down. DO NOT TWIST ELECTRODE. Replace with the new electrode. Be sure to line up the prongs and attach carefully.