* Four active strain gages.
* Sensitive to bending strain only.
* R1 is an active strain gage measuring the compressive Poisson effect (–νε).
* R2 is an active strain gage measuring the tensile Poisson effect (+νε).
* R3 is an active strain gage measuring the compressive strain (–ε).
* R4 is an active strain gage measuring the tensile strain (+ε).
* Minimize the effects of temperature.
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