English to Spanish Tech/Engineering Medical: Instruments Dynamic contact angle meter and tensiometer

"Insert the sample vessel carefully into the temperature controlled receptacle without touching the options holder."

"If you want to analyze a liquid (e.g. detection of the surface tension or the density) or a solid (e.g. detection of the contact angle or the wetted length) yoy must install the probe or the sample into the options holder at the balance."

En el mismo texto aparece "sample holder", que es " portamuestras", y no consigo averiguar a qué se refiere con "options holder"... Thanks for your help!!!