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Change the battery and restart the meter. Light High: There is too much light to perform a measurement. Please check the preparation of the zero cuvette. Light pH Tester. INSTRUCTION MANUAL. Before using Hanna Instruments products, make sure that they are entirely suitable for your specific application and for the The Checker Plus features a low battery indicator, When the battery is running low, the tag will appear on screen. When the battery has been depleted, the tag Please read this instruction manual carefully before using this instrument. Hanna Instruments® CAL Check cuvettes are made with NIST. Light Low: There is not enough light to perform a measurement. Please check the preparation of the zero cuvette. Inverted Cuvettes: The sample and the zeroBefore using Hanna Instruments products, make sure that they are entirely suitable for your Glass Cuvettes and Caps for Checker® HC Colorimeters (2 pcs.). Hanna Instruments. CAL Check cuvettes are made with NIST traceable standards. The built-in tutorial mode guides users step-by-step through the measurement. Hanna's product manuals provide you with all the instructions to properly use our instruments. Also, where applicable, they provide the necessary