Graigar produces and distributes professional industrial measurement instruments, testing tools, and generator control modules for scientific and commercial use.
Graigar is a manufacturer and distributor of specialized measurement and control equipment. The brand's diverse product catalog includes dissolved oxygen meters, frequency meters, gas detectors, ultrasonic flow meters, anemometers, and advanced generator control panels.
Designed for industrial, scientific, and commercial applications, Graigar instruments deliver precision and reliability for professionals. Widely utilizing B2B and e-commerce platforms to distribute its technical equipment, Graigar provides specialized diagnostic and testing tools serving the agriculture, manufacturing, water treatment, and electrical engineering sectors.
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Turn the unit on, wait for the measurement value to become stable, ensure the electrode is clean, and hold the CAL/ESC key for over 1 second until the auto-calibration completes.
Error code E02 indicates that the measured value is over the lower limit. If this appears during calibration, you may need to replace the diaphragm sleeve.
It is recommended to replace the diaphragm sleeve every 3-6 months, or immediately if you notice unstable measured data, air bubbles in the system, or an E02/E03 error code.
You can find and download comprehensive user manuals, calibration instructions, and technical specifications for Graigar measurement tools on this page.