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Extech Current & Voltage Calibrators/Meters
Precision "source" for calibrating process devices and measuring DC process signals from 0 to 24mA and 0 to 20V
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Extech Current Loop Checker 
The current loop checker is a handheld battery operated device that provides a quick and easy simulated output of
4mA, 12mA and 20mA for use in testing and calibrating instruments. Also, it is the ideal device to set up indicating
ranges on panel meters and controllers.
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Extech Microprocessor Calibrator Thermometers
The meter can be switched to the mV mode where Measurement and Source values can be displayed in millivolts rather than temperature. Careful use of this device will provide years of reliable service.
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Extech Precision Multifunction Calibrators
Congratulations on your purchase of the Extech 422123 Precision Multifunction Calibrator. This device can source mA, mV, V, Temperature (°C/°F) and Frequency. This device also offers STEP and AUTO RAMP features. Careful use of this meter will provide years of reliable service.
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Extech Oyster® Multifunction Process Calibrators
The Model 412400 can Measure or Source Current, Voltage, and Thermocouple Temperature signals. In SOURCE/MEASURE mode, the meter can also Power and Measure simultaneously with 24Vdc loop power.
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Extech Instruments 
