PNG ICO ICNS MORE
Business & finance
Smooth
Pretty office icons part 5
test, document, write
DarkGray
256x256
Healthcare & medical
The Centigrade MedicalSeries
tubes, laboratory, test
DarkSlateGray
32x32
Sigma
user, tester, Man
Black
400x400
Shopping & e-commerce
Woothemes Ultimate Icon Set
Chemistry, tube, science
128x128
Network & communications
Oxygen
Chemistry, test, flask
Gainsboro