of the probe connector the third optical sonde 30 c positioned perpendicularly relatively to the optical transmission path 56 is used to detect scattered light the measurement of scattered light enables detecting small droplets bubbles or solid particles in liquids thus in this first configuration of the downhole fluid analysis tool 50 the third optical sonde 30 c is adapted for the measurement of water turbidity in a second configuration the third optical sonde 30 c positioned perpendicularly relatively to the optical transmission path 56 is used to illuminate the fluid with a light of high energy e g the third optical sonde 30 c is coupled to a laser source the molecules present in the fluid are locally excited and re emits in a light spectra comprising various light rays related to the chemical compounds present in the fluid the positioning of the third optical sonde 30 c coupled to the laser source substantially perpendicularly to the optical transmission path 56 defined by the two other probes enables avoiding blinding the optical sonde used as a detector with direct high energy light with the optical probe of the invention it is possible to adjust the position of the first optical probe 30 a or of the second optical probes 30 b or of both probes 30 a 30 b respectively relatively to the threaded holes 53 a 53 b respectively so as to control the length of the optical path 56 between both tips this length adjustment is easy to perform by sliding probes inside the analysis pipe portion.