Magnetometric - this is to find professional sites (archaeology and salvaging sites).
Gravimetric - this is to find asteroid belt sites.
Radar - this is to find hacking sites.
Ladar - this is to find gas cloud-related sites
Unknown - this has a chance to find a wormhole or a complex with a chance to escalate.

Caldari-Gravimetric-Spatial Destabilizer-Blue
Amarr-Radar-White Noise-Yellow
Gallente-Magnetrometric-Ion Field Projector-Green
Minmatar-Ladar-Phase inverter-Red

Key - NPC name: Damage Type it uses (Damage to use against it)
Angel Kinetic/Explosive (Explosive)
Amarr Navy EM/Thermal (Thermal)
Blood Raiders EM/Thermal (EM)
Caldari Kinetic/Thermal (Thermal / Kinetic for Temuras)
Concord EM/All Dmg Types (Thermal)
Gallente Kinetic/Thermal (Thermal)
Guristas Kinetic/Thermal (Kinetic)
Khanid EM/Thermal (Thermal)
Minmatar Fleet Thermal/Exp (Thermal / Exp for Darkanas)
Mercenary M/Thermal/Kinetic (Thermal)
Serpentis - Thermal / Kinetic
Sansha's Nation - EM / Thermal