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Millipore Milli-Q Gradient - Laboratory Water Purifier/Purification System CAT# ZMQP6V001 S/N: F6SN77906A Electrical Rating: 120V 60Hz 100VA Condition is used. System Error #4 illuminated on screen. Error #4 - The measured Resistivity Value (@ 25Deg C) is between 3.5 Micron cm. and 2.5 Micron cm. Possible causations: The cartridges in the purifier are old and may need to be replaced. Insufficient water inside the purifier to thoroughly test. The temp of the water inside is less than 25Deg C.