Hanna HI7039L 5000 µS/cm Conductivity (EC) Calibration Solution – 500 mLThe Hanna HI7039L is a premium, laboratory grade Electrical Conductivity (EC) calibration standard. Formulated to exactly 5000 S cm (5. 00 mS cm) @ 25C, it is packaged in an FDA compliant, light blocking 500 mL bottle. Traceable to NIST standard reference materials, it is widely utilized to calibrate EC meters used in commercial hydroponic nutrient mixing, light industrial boiler water, and general agricultural diagnostics. Lock in your crop's

use the HI711 Total Chlorine Checker

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You can use the Bosch 12V Professional Li-Ion battery (same as the GSB/GSR 120 tools) for long runtime

NIST Traceable: Manufactured strictly against National Institute of Standards and Technology reference materials for guaranteed accuracy

Environmental water analysis

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Range 1: 0 to 100 mg/L as CaCO₃

and controlled farming systems

The HI709 provides the extreme digital precision required to manage this aggressive metal without the high cost of a benchtop photometer

Model: GWS 2200-180 H