Key (instrument) Key (instrument) A key is a specific part of a musical instrument. The purpose and function of the part in question depends on the instrument. On instruments equipped with tuning machines, violins and guitars, for example, a key is part of a tuning machine. It is a worm gear with a key shaped end used to turn a cog, which, in turn, is attached to a post which winds the string. The key is used to make pitch adjustments to a string. With other instruments, zithers and drums, for example, a key is essentially a small wrench used to turn
Plate reader instrument (multi-mode plate reader). The range of applications for multi-mode plate readers is extremely large. Some of the most common assays are: While "plate reader" usually refers to the devices described above, many variations are available. Some examples of other devices working with the microplate format are: Known plate reader developers are the companies BioTek and BMG Labtech. Plate reader Plate readers, also known as microplate readers or microplate photometers, are instruments which are used to detect biological, chemical or physical events of samples in microtiter plates. They are widely used in research, drug discovery, bioassay validation, quality control and