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The SMAN360 automatically calculates target superheat, so hvacr professionals don't have to worry about guesswork or manual calculations. With the SMAN360 you also get a built-in micron gauge with resolution from 50 to 9, 999. Plus the vacuum gauge in the SMAN360 digital refrigerant manifold has a micron alarm which allows technicians to set the alarm to a chosen micron level, and when the vacuum reaches that level, the alarm will sound, freeing you up to keep working when pulling a vacuum. made in United States. Manufactured by Fieldpiece instruments Inc.