The Model ZK digital pressure test gauge with 0.1 % reading accuracy uses transducer technology and a stainless steel diaphragm for high overpressure protection. The transducer technology provides enhanced accuracy over the entire pressure range. The ZK has no moving parts and thus, may provide a long life with fewer re-calibrations. The stainless steel NEMA construction also provides EMI and RFI protection. The ZK provides high resolution with an easy to read digital display. There are no operator errors due to interpolation of hash marks or parallax errors. The Model ZKW is powered by one or two common 9 V alkaline batteries. The Model ZKT is powered by a 110 Vac adapter. The Model ZKV is powered by an 11 Vdc to 32 Vdc power supply. 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.