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Weschler Instruments is a manufacturer and distributor of electrical and electronic measurement equipment. Customers worldwide use our products in power plants, steel mills, chemical plants, paper mills and other industrial applications that require rugged, reliable and accurate instrumentation.
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Chart Recorder - RH520A Extech

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Extech RH520A Temperature + Humidity Chart Recorder.

The RH520A measures and displays Temperature, Humidity, and Dew Point. The remote (detachable) probe senses the ambient conditions while the LCD display graphs and provides numerical representation of the readings.

• Graphical & digital data display plus date & time
• 49000 reading memory
• Programmable resolution
• Audible & visual alarms
• Wall or benchtop mounting
• RS232 & USB communications
Supplied with 3' probe, stand, RS-232 cable, AA batteries & AC adapter.


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Item #

Item Name

EX/RH520A Humidity + Temperature Chart Recorder
EX/RH520A-NIST Humidity + Temperature Chart Recorder w/NIST certificate
EX/SL123 AC Alarm Relay Module with 9' (3m) cable
EX/SL124 DC Alarm Relay Module with 9' (3m) cable
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