TDS Meter Digital Water Tester - Hofun TDS, EC & Temperature Meter 3 in 1, 0-9999 ppm Accurate, PPM Meter for Drinking Water Test, Coffee, Swimming Pool, Aquarium, RO/DI System, Hydroponics sold2024 PNP signal output (please explain

PNP signal output (please explain with the manufacturer when selecting)

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TDS Meter Digital Water Tester - Hofun TDS, EC & Temperature Meter 3 in 1, 0-9999 ppm Accurate, PPM Meter for Drinking Water Test, Coffee, Swimming Pool, Aquarium, RO/DI System, Hydroponics sold2024 PNP signal output (please explainTDS Meter Digital Water Tester Hofun TDS, EC & Temperature Meter 3 in 1, 0 9999 ppm Accurate, PPM Meter for Drinking Water Test, Coffee, Swimming Pool, Aquarium, RO DI System, Hydroponics Hofun TDS Water Quality Tester CONCERNED ABOUT YOUR WATER QUALITY? Hofun TDS Water Tester works like a guard who helps monitor water quality to tell you whether the water meets standards of drinking, aquarium, RO OI system, etc, so that you have a clear mind of water