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The SPA Design dual digital gauges offer excellent performance and flexibility at a competitive price. Microprocessor control makes them very accurate, compact, and easy to use. The new generation of gauges uses the latest surface mount micro circuit technology for the ultimate in reliability and light weight. Built-in warning lights for high temperature on each channel can be user-programmed to trigger at any value. Peak temperature and lowest voltage can be recalled later. User-programmable metric or Imperial (°C or °F) units. You can even program the backlight color! Mounts in 2 1/16" hole and includes temperature sending unit.