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Hanna Instruments pH 4.01 Calibration Solution 1 Liter HI7004 Type_Wheatgrass Operating your hydroponics system farming course Operating your hydroponics system and green color coded backlight External Event Input input for level controller or flow switch to disable dosing pump in the event of no chemical when using a level controller or no flow when using a flow switch galvanically isolated Alarm Relay Output SPDT 2 Temperature chart of the actual pH value at various temperatures printed on each bottle Accuracy of + 0
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