$70

Brinkmann Instruments Metrohm/Brinkmann pH-103 pH/mV Meter for Titration "C4A"

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Chauvin Arnoux CA10101 Portable Waterproof Ph Tester -2 to -16 + Case

$174

NANOLUX OG Series 1000 W 277V Digital Electronic Grow Ballast NEW.

$80

2 Fisher Scientific AP61 Accumet Portable Laboratory PH Meter

$399.95

Mettler-Toledo® 51302910 | FE20 FiveEasy pH Benchtop Meter (Meter Only; Electrod

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Hach HQ411D pH/mV Meter - pH and ORP

$2880

HANNA INSTRUMENTS PCA320 CHLORINE/pH ANALYZER PCA-320 230VAC

$199.99

YSI EcoSense EC300 w/probe: Conductivity, Salinity, Temp Meter $640 NEW

$199

Ph Meter Oyster 10 The Oyster Series Extech

$19.46

PH Meter TDS Meter Digital Water Quality Tester 0-14 pH 0-9990 PPM TDS LCD

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Gestra LRS1-5 220V 3.5VA Conductivity Switch

$350

Hach DR300 Chlorine Colorimeter Meter Portable Pocket Low/High Range CL2