Visual displays are not normally temperature compensated or linearized. They often use mechanical linkages which are subject to wear over time giving a final accuracy between 5 and 10 percent of the reading, i.e., there is little or no conditioning. However, with most of the nonlinear sensors, the scale of the indicator will be nonlinear to give a more accurate indication. These displays are primarily used to give an indication that the system is working within reasonable limits or is within broadly set limits, i.e., tire pressures, air conditioning systems, and the like.