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INKBIRDPLUS pH Meter, Digital 4 in 1 PH EC TDS Temp Meter for Water Hydroponics, Waterproof and EC PPM Water Tester with Backlight for Laboratory, Nutrients Growing, Household Drinking, Pool, Aquarium: Amazon.com:
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Hanna Instruments Grochek pH/EC/TDS/C Portable Meter w/ Cal Check / HI9813-6N ..(from#_VM Innovations_375351692351496 - Walmart.com
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