Update index.mdx

docs/repo/details_standards/analysis_test/index.mdx

@@ -39,7 +39,7 @@ Isomeric mixtures: Where isomeric mixtures are reported, such as diastereomeric
 Microscopy images should be captured at an appropriate magnification to show a representative sample. When high-magnification images of selected particles are used they must be supplemented by low-magnification images of the broader sample, and the use of histograms and statistics to describe size and shape distributions is encouraged.<br />
 
 
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+Instruments: commercially available instruments are referred to by their stock numbers (for example, Perkin-Elmer 457 or Varian HA-100 spectrometers)
 
 ## Order of analyses