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Extech RF40 Hand held Refactometer with Automatic Temperature Compensation EXTECH RF40 The Extech RF40 hand held refractometer optically determines the freezing point of ethylene glycol and propylene glycol Additionally battery acid concentration can be measured and the battery charge determined Only three drops of the liquid are needed for testing Supplied with case calibration screwdriver and calibration solution Extech RF40 Hand Held Refractometer
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