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ESPRESSO is a new high-resolution ultra-stable spectrograph for the VLT,which had its first light on Telescope on November 27th, 2017. The instrumentis installed in the Combined Coud\'{e} Laboratory and linked to the 4 Units ofTelescope through optical Coud\'{e} Trains, being the first spectrograph ableto collect the light from the 4 UTs simultaneously. One of the key sciencegoals of the instrument is to test the stability of nature's fundamentalcouplings with unprecedented resolution and stability. ESPRESSO will allow toeliminate current known systematics and test the claim by Webb et al 2012 of aspatial dipole in the variation of the fine-structure constant. These improvedresults (either null or variation detections) will put strong constraints on arange of cosmological and particle physics parameters.

ESPRESSO's Early Commissioning Results and Performance Related to Tests of Fundamental Constant Stability