Series A1 Digital Differential Pressure Gauge is a patented microprocessor based digital pressure gauge for positive, negative, and differential measurement designed to be a direct replacement for mechanical gauges. The Series A1 digital differential pressure gauges utilize an extremely stable piezoresistive sensing technology to give a standard full-scale accuracy of 1%. For applications requiring better accuracy, the A1 is also available with The A1 pressure gauge also has an optional for applications requiring an output signal. The A1 features a bright, which gives the gauge improved readability and precision. The A1 digital differential pressure gauges also feature 5 user selectable engineering units.