When standard spectroscopy tools are not enough to unravel the intricate ultrafast dynamics of photoactive systems, multi-pulse time-resolved spectroscopic techniques can be utilized to yield additional insight. Light Conversion's HARPIA‑TB is a third beam delivery module for the HARPIA‑TA mainframe system that adds an additional dimension to typical time resolved absorption measurements. A temporally delayed auxiliary (third) laser pulse, (up to 4 ns), can be introduced before or during the pump-probe interaction to perturb the on-going pump-induced photodynamics.