country obtained from

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  Australia (1) Belgium (2) Canada (1) France (2) Germany (2) Netherlands (15) Singapore (1) Sweden (1) United Kingdom (4) United States (10) Venezuela (1)

graduation

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  deg (17) gon / grad (8) m (3) mil (6400) (2) yard (5)

fine reading

•  direct (analog) (19)
•  drum micrometer (2)
•  scale micrometer (5)
•  scale micrometer (double) (4)
•  vernier (double) (1)
•  vernier (single) (1)

Type of use

•  Home / hobby (2)
•  Military (6)
•  Navigation (3)
•  Survey (29)

Material

•  Aluminium (1)
•  Brass (16)
•  Plastic (2)
•  Steel (6)
•  Wood (1)

image direction

• (no filter) 

  inverted (13) upright (17)

Brand

•  Ajax Engineering Co. (1)
•  Davis Instruments (1)
•  E.R. Watts and Son (1)
•  Henry Hughes and Son (1)
•  JH Steward (1)
•  Keuffel and Esser (2)
•  Schick (3)
•  T. Cooke and sons (1)
•  US Naval Gun Factory (1)
•  Western Electric (1)
•  Wild Heerbrugg (36)