Strain Ga(u)ges:

 

http://www.vishay.com/brands/measurements_group/guide/a110/acc/ak_intro.htm
 
http://www.cooperinstruments.com/pdf/Tempeffects.PDF
 
http://www.hbm.com/en/products/xq/asp/OpenMenuItem./menu.product/subcat.11/category.3/prodid.1/qx/ProductDataSheet.htm
 
http://www.hbm.com/en/products/xq/asp/OpenMenuItem./menu.product/subcat.11/category.3/prodid.4/qx/ProductDataSheet.htm
 
http://www.omega.com/techref/strain-gage.html
 
http://www.omega.com/ppt/pptsc.asp?ref=SPAN_RESISTORS&Nav=pree05
 
http://www.omega.com/toc_asp/frameset.html?book=Pressure&file=STRAIN_GAGES
 
http://www.omega.com/ppt/pptsc.asp?ref=XDUCER_GAGES&Nav=pree02
 
http://www.omega.com/ppt/pptsc.asp?ref=STRAIN_ACC&Nav=pree05
 
http://www.omega.com/ppt/pptsc.asp?ref=SG1-KIT&Nav=pree05
 
http://www.nmbstraingages.com/