With the new Winchester Model 1, instrument technicians only need to carry one gauge to achieve high accuracy calibrations in the field. The device uses a patented internal mechanical switching valve to automatically select the correct high accuracy piezoresistive sensor. This new technology provides the user both over-range protection and high accuracy across the entire range where it would otherwise require up to seven digital gauges or modules. Future re-certification costs are significantly lowered by having only one calibration, rather than many as would have been required in the past. Its rugged design comes equipped with a protective rubber housing. Large one-line display with vibrant backlight is suitable for any light condition. Model 1 also functions as an absolute pressure gauge.