Matlab Compound Mortgage

What are the classifications?

1. measure physical quantities: temperature instruments, strength, power, etc.
2. The operating principle: mechanical, pneumatic, hydraulic, electrical, electronic, optical, etc.
3. type reading: analogue and digital. graduated scales used in analogue and generally pointer, while the digital display reading in the form of digits on a screen.
   
4. The purpose and place of employment: laboratory instruments, field (outdoor use), and workshop or industry.