As with conventional-scale sensing, the qualities of interest are high resolution, absence of drift and hysteresis, achieving a sufficient bandwidth, and immunity to extraneous effects not being measured. Microsensors are typically based on either measurement of mechanical strain, measurement of mechanical displacement, or on frequency measurement of a structural resonance.
Not only this, but the new ones are also coming in the light. In short, it can be said that it has changed the definition of separation science somewhere a lot. Since microsensors do not transmit power, the scaling of force is not typically significant.