Versatile Water Quality Applications When the equipment has an obvious fault, please do not turn it on and repair it by yourself.Contact us quickly! Before measuring, the black rubber protective cover should be removed. It should be regularly according to the usage environment.ClearSensorMeasure the attachment of the probe, attachments will lead to measurement errors; avoid probes when cleaning Scratches in the light guide part. ( It is recommended that everyClean once every 30 days) It is recommended to wash with water flow.SensorThe outer surface, if there is stillDirtResidue, please useSoft and wetWipe with a cloth. The equipment should be calibrated before each use, and it is recommended for long-term use every. ThreeCalibrate once a month, the calibration frequency should be adjusted appropriately according to different application conditions (the degree of dirtiness of the application, the deposition of chemicals, etc.)., Manufacturer: GQNBLVHZUPDM