source: http://www.pentaxsurveying.com/en/index.htm
 

source: http://www.sokkia.com/
 

source: http://www.leica-geosystems.com/en/index.htm
 

source: http://www.trimble.com/survey/Digital-Levels.aspx
 

source: http://www.spectraprecision.com/default.aspx
 

source: http://www.nikonpositioning.com/default.aspx
 

source: http://www.stonexsurveying.com/
 

source: http://www.cstberger.com/Products/TotalStations/CST202.htm
 

source: http://www.davidwhite.com/Optical_tools/458932.html
 

source: http://www.topconpositioning.com/products/mapping-and-gis/hand-held-devices/field-controllers/grs-1-for-gis.html