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Hm Digital Ap-1 Aquapro Tds/ºc/ºf Ppm

snoop832

By snoop832
in Hot Tub Water Chemistry

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polyvue Spa Savant

polyvue

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What should i calibrate this meter to. NACL or 442? Thanks

I guess the manual doesn't say, huh? When I borrowed a TDS meter some months ago I used 442 to calibrate.

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