The differential IPT is also a two-port device available in 1, 2, 5, 10 and 20 psid ranges. Except for differential electrical biasing of the sensor signal conditioning circuitry, it is identical to the gauge IPT. However, the movement of the differential diaphragm is characterized in both directions. Port P1 may be either positive or negative with respect to port P2. For example, a 5 psi differential IPT will provide readings from -5 to +5 psid. The differential IPT has a maximum total error band of ±0.10% full scale output over a temperature range of -40ºC to +85°C.