Usefull Information:
Enemies ------- Hardener to use ------ Damage type to use

Blood Raider --- EM/Thermal --------------- EM
Guristas ------- Kinetic/Thermal ------------ Kinetic
Sanshas ------- EM/Thermal --------------- EM
Serpentis ------ Thermal/Kinetic ------------ Kinetic
Angel. --------- All Resis (pri. Expl. ,Kin.) --- Explosive
Mordus -------- Kinetic/Thermal ------------ Kinetic
Rogue Drones -- All Resis (pri. Expl. kin) ---- EM
Mercenary ----- All Resis (pri. EM, Therm) -- Thermal
Minmatar. ------ All Resis ----------------- Thermal (sec. Explosive)
Gallente. ------- Kinetic/Thermal (sec..EM) --- Thermal

Below -2 = not in 1.0 sec systems
Below -2.5 = not in 0.9 sec systems
Below -3 = not in 0.8 sec systems
Below -3.5 = not in 0.7 systems
Below -4 = not in 0.6 systems
Below -4.5 = not in 0.5 system

Gravimetric: Mining site
Ladar: Gas cloud mini
Magnometric: Arch/Salvage site
Radar: Hacking Site