Microprocessor based digital pressure gauge for positive, negative, and differential measurement designed to be a direct replacement for mechanical gauges. Mounts in Industry standard Holes, 5 selectable engineering units. The A1 features a bright ½" LED display. optional 4-20 mA output for applications requiring. A1 is also available with 0.5% or 0.25% accuracy. Accuracy : :± 1 % ,Universal Power 16-265