Tek Know's PC700 provides precise pressure calibration. An integrated hydraulic pump produces test pressure, which is displayed on a four-digit LCD. The PC700 distributed in the U.S. by TTI Inc., Williston, Vt., uses a special thin-film strain-gage transducer with built-in temperature condensation. Accuracy is maintained when pressure decreases, making it suitable for verifying hysteresis. All units are calibrated in positive and negative directions. Windows Pre Cal software can be interfaced with a standard RS-232 port for semiautomatic calibration and record keeping.