<p>The testo 557 digital vacuum gauge fulfils numerous functions, which are required for working on refrigeration systems and heat pumps, in just one instrument: for example superheating/subcooling calculation, vacuum measurement, temperature-compensated leakage test. You can also use a practical app to monitor the manifold via your smartphone/tablet and store the measurement results or send them by e-mail.
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  Calculation of superheating and subcooling in real time: no manual calculation, which is prone to error
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  Connect to smartphone/tablet app: remote monitoring and smart measurement documentation
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  Precise external Pirani gauge for vacuum measurement, temperature-compensated leakage test, automatic ambient pressure measurement
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  The 60 most common refrigerants are stored in the instrument, subsequent updates possible (via app)
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