I don’t know of any tools per se. I suspect that people have a track of what karma most of their recent comments had, so they can simply check by looking there. There are also some subtle signs: For example, for most people the common karma on a comment is zero. So even if you don’t remember your karma (or if you are looking at someone else’s) and there are a lot of recent comments at −1 on a variety of different subjects that don’t look obviously bad, that’s a sign.
So that certainly sounds like karma assassination to me (assuming that you remembered the number correctly before hand). In general, karma almost always is increasing if one is a user in good standing, so on any given day, the variance will for most days probably be a question of how much it goes up by more than anything else. A drop of 14 in a single day in that context seems extreme.
I don’t know of any tools per se. I suspect that people have a track of what karma most of their recent comments had, so they can simply check by looking there. There are also some subtle signs: For example, for most people the common karma on a comment is zero. So even if you don’t remember your karma (or if you are looking at someone else’s) and there are a lot of recent comments at −1 on a variety of different subjects that don’t look obviously bad, that’s a sign.
Edit: Over what time span was the 14 point drop?
Less than a day.
So that certainly sounds like karma assassination to me (assuming that you remembered the number correctly before hand). In general, karma almost always is increasing if one is a user in good standing, so on any given day, the variance will for most days probably be a question of how much it goes up by more than anything else. A drop of 14 in a single day in that context seems extreme.