What's up with thoose F-n dmgmeters?

[sirspikey]

Tested different meters, this is from same fight against a dummy. (Don't mind the level of dps, didn't go all out ).

dps Skada 968,5 : Violation 970 : Recount 951,0
Total dmg: Skada 152048 : Violation 164200 : Recount 152716
hit: Skada 77% : Violation N/A : Recount 78%
crit: Skada 7,3% : Violation N/A : Recount 7,3%

How come Skada and Violation show the same DPS but not same total damage!?!? And also Recount and skada show the same total but different dps?!?
Are they using different equations? or listening to different events?

Is there ANY meter out there you can trust? Plz give suggestions