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What does IP65 mean?

What is pH? | Why do I need to measure pH? | What do I use to measure pH? | What is conductivity? | Why do I need to measure conductivity? | What do I use to measure conductivity? | What is EC, what is CF, what is ppm, what is TDS, what is mS/cm and uS/cm? | What is a Bluelab Meter? | What is the Bluelab Truncheon® Meter? | What is the Bluelab pH Truncheon® Meter? | What are replaceable Contact Rings? | What are single and double junction pH probes? | What is a Bluelab Controller? | Why do we use Controllers? | Do any Bluelab products have data logging and PC comms links? | What are pH calibration solutions? | Which Calibration Solution do I use first when calibrating a Bluelab pH instrument? | Why do we need to clean the probes on Bluelab instruments? | What does IP65 mean? | My Truncheon Meter does not work! Why not? | My Truncheon Meter measures lower than expected! Why? | My Truncheon Meter measures higher than expected! Why? | Will low batteries cause my Truncheon Meter to read inaccurately? | Can I use Alkaline batteries in my Truncheon Meter? | My Truncheon Meter gives varying readings! Why? | Can I recalibrate a Truncheon Meter to my conductivity solution?

A. I - Ingress. P - Protection. 6 - Totally protected against dust. 5 - Protected against water sprayed from all directions.