That is EC measured in microsiemens (μS/cm). We like to speak in millisiemens (mS/cm) so as not to be confused for PPM, so 2380μS is 2.38mS. There is probably a setting on your pen that will change it from μS/cm to mS/cm, but obviously all you have to do to convert it to milli is move the decimal point 3 places to the left.
So your EC is 2.4 and most people like to stick within 1.3-1.6 during flower, unless they've conditioned their plants to accept a high EC because they think more is better.
You should just drop your EC down to like 1.2.
