Hanna Instruments Cal-Check Solution, 20 mL - Case of 25 Bubble Bags & Wash Systems Stock up on replacement discs

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Hanna Instruments Cal-Check Solution, 20 mL - Case of 25 Bubble Bags & Wash Systems Stock up on replacement discsThe Hanna Instruments PEI Plastic Body pH Electrode will give anybody a chance to test pH while still being affordable. HI50021P is a premium quality calibration check solution used exclusively for the HI9813 6 portable pH EC TDS Temp. meter. Each sachet has the lot number and expiration date stamped on it and is made of light block foil ensuring freshness each time one is opened. Hanna's line of solutions have been specially formulated to have an