The hand-held Model JD wet/wet differential pressure gauge delivers long-lasting, enhanced accuracy performance. Accuracy of 0.2 % coupled with an enhanced resolution, 4½-digit display makes this unit an excellent transfer standard for calibrating pressure measuring equipment. The JD is rugged and features high/low pressure capture with an update rate of three times per second. These units are manufactured from 316 L Stainless Steel wetted material for ranges 1 psi to 30 psi and 17-4 PH Stainless Steel wetted material for ranges above 30 psi and use sensor technology which has no moving parts, requires little recalibration, and has excellent overpressure tolerance. Each unit has a membrane face with raised buttons and tactile feedback for setup and operation. The high, low, and clear buttons are easily accessible on this front membrane. Zero adjustment and zero offset/tare functions are standard on each unit. Calibration and setup parameters are stored on a memory chip to protect from loss even when power is interrupted. Unauthorized set ups and calibrations are also blocked with internal security. Various combinations of the front panel buttons can be de-activated.