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Liquid Flow Meter - Brass 1/2 Nominal Threaded : ID 833 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: VIVOSUN pH and TDS Meter Combo, 0.05ph High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1 TDS EC Temperature Meter for Hydroponics, Household Drinking, and Aquarium, UL Certified :
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Mini 3-wire Volt Meter (0 - 99.9VDC) : ID 705 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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