Strength machines are meant to help you build up muscles. They do not, however, help you measure your strength. Strength can be measured by the hardness of the physical task you do. No machine can measure strength.
sit ups measure your stomach strength.
The Richter magnitude scale is used to measure the strength of an earthquake.
By measuring the strength of the force it exerts
The strength of earthquakes
sit ups measure your stomach strength.
The Seismograph is used to measure the Magnitude of an earthquake.
Hurricane strength.
magnitude
it was very strong
With a Ph meter.
A seismograph.