microscale

Short definition from Wiktionary

Noun

1. 1
   A very small or microscopic scale.
2. 2
   The scale of microanalysis.
3. 3
   A scale of physical consideration or of bounds having a characteristic dimension typically ranging from 1 to 999 µm (under 1 mm).

Adjective

1. 1
   Extending over a relatively small area, particularly less than 1 kilometer; smaller than mesoscale.