Enzyme recorder
An enzyme recorder was a type of bio-scanner that recorded the enzymes in a lifeform. Effective use of the recorder required readings on three different wavelengths of light. 

In 2268, in order to destroy a giant space amoeba, and free the trapped , a specially equipped shuttlecraft was required to penetrate the  to find a way to destroy the amoeba. An enzyme recorder was among the special equipment taken on board the shuttle, by suggestion of Doctor McCoy. ()
Medical equipment