Chart Recorder measures temperature and humidity.

Press Release Summary:

Model RH520 provides simultaneous numerical and graphical displays of humidity from 20-95% and temperature from -20 to 140°F. Graphic displays are cursor-controlled with adjustable X/Y axis resolution, allowing temperature and humidity to be monitored within user-specified range. Sample rate is adjustable from 0.1 sec to 200 min/sample, permitting daily, weekly, or monthly graphs. Internal memory records up to 49,000 readings and can be transferred to PC for analysis.

Original Press Release:

Extech Instruments Showcases New Graphical Humidity / Temperature Chart Recorder At National Plant Engineering 2005

Extech Instruments, a major supplier of test and measurement equipment for the industrial marketplace, will showcase its new graphical humidity/temperature chart recorder, Model RH520, at the National Plant Engineering Show at the McCormick Place in Chicago, IL, from March 7-10, 2005. Easy to set up and operate, it offers the best value in paperless chart recorders available in the market today.

The unit can be either desk or wall mounted, and provides simultaneous numerical and graphical displays of humidity (20 to 95% RH) and temperature (-20 to 140°F). The RH520 also calculates dew point. The multiple graphic displays are cursor controlled and have adjustable X/Y axis resolution which allows the user to monitor both temperature and humidity within a user specified range. The sample rate is adjustable from 0.1 second to 200 minutes per sample, permitting daily, weekly or monthly graphs.

Extech's RH520 features an internal memory that records up to 49,000 readings with time and date, and can be transferred to a PC for data record-keeping, analysis and printing. It has a detachable probe that extends up to 1 meter for measurements in enclosed environments. High and low set points trigger audible and visual alarms, and an external remote alarm module is available.

The basic accuracy of the RH520 is 3.5%RH and 1.8ºF/1ºC. It comes complete with a built-in stand, a humidity/temperature sensor, and 3 AA batteries.

For more information on the RH520 or Extech Instruments, visit Booth # 136 at the National Plant Engineering Show 2005, or the company's Web site at or call 781-890-7440.

About Extech Instruments
Headquartered in Waltham, Massachusetts, Extech Instruments is one of the largest suppliers of test and measurement equipment worldwide. Founded in 1971 Extech is known for its depth and breadth of products and its innovation in providing instruments with unique combinations of features that make them highly useful and very convenient.

The company is comprised of two divisions and is ISO 9001 2000 certified. The Instruments Division which designs and supplies handheld test and measurement instruments, offers a depth of products in over 14 major product lines applicable in a wide variety of markets. The Data Systems Division manufactures and distributes custom portable receipt printers. Both the test and measurement instruments and the portable printers are distributed worldwide through leading representatives, distributors and OEMs.

For further information about the Extech Instruments and its products, call 781-890-7440 or visit

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