Pads are flat test points on PCBs that can be contacted with both aggressive and passive head shapes. Aggressive: For safe penetration of OSP or contaminated surfaces (soldering process residues), aggressive and self-cleaning head shapes are recommended (e.g. tip style 91, dagger) Passive: Passive tip styles are used for clean surfaces and to avoid puncture points (e.g. tip style 05, bullet-nosed). NOTE: To avoid damaging multilayer PCBs, the penetration depth of the tip into the outer layer must be observed. This is particularly relevant for aggressive tip styles in combination with a high spring force.