1. Based on Similar Triangles

1. Christen Hypsometer
2. Improved Callipers
3. Smythies’ Hypsometer
4. Improved Smythies’ Hypsometer

Disadvantages

• It’s very slow, fatigue, heavy and rough information

Advantages

• Able to make manually even in the field
• Used by unskilled labor

2. Based on Trigonometrical Principles

1. Abney’s Level
2. Brandis Hypsometer
3. Relaskop
4. Topographical Abney’s Level
5. Haga Altimeter
6. Blume-leiss Hypsometer

Disadvantages

• Manufactured scientifically, repair is difficult on spot, Limited use and expensive
• Only used by skilled labor

Advantages

• It’s fast, easy to carry and accuracy maintained available in markets
• Adopted by many countries