This transient absorption spectrometer has been developed for spectroscopic and kinetic laser flash photolysis measurements. It includes a ceramic xenon light source; 125 mm monochromator; Tektronix 9-bit digitizer TDS-3000 series with 300 MHz bandwidth; compact photomultiplier and power supply, Pentium computer with 17” monitor and back-up drive, cell holder and fiber optic connectors, fiber optic sensor for laser-sensing pretrigger signal, computer interfaces and the software needed to operate the system. The mLFP-111 instrument does not include the laser, but generates 5 volt trigger pulses suitable for most lasers, including the two-pulse sequence required for YAG lasers (flash lamps and Q-switch), with programmablefrequency and delay. The m-LFP 111 is capable of recording all the transient signals normally acquired with conventional laser flash photolysis (LFP) systems, but in addition it can perform much better in long times time scales.