C S Bio offers low cost synthesizers to the research community. The fully automated CS 136XT synthesizer can add unlimited amino acids in a single run with a synthesis scale of 0.2 to 5.0 mmol. This instrument can be upgraded to a larger capacity. The software allows quick development and use of synthesis protocols. The instrument hardware allows the use of practically any synthesis protocol or chemistry. The adjustable solid state sensors allow quick and easy adjustment of the synthesis scale. All of our synthesizers guarantee complete resin to solvent contact because we use a pneumatically operated rotary actuator for smooth, 180 degree inversion mixing. All C S Bio synthesizers carry a full one year warranty.