

🧪 Calibrate with Confidence — Stay Ahead in Water Quality Testing!
The Hach SpecCheck Secondary Gel Standards Set offers four sealed 10 mL gel cells with precise chlorine concentrations (0-2.0 mg/L Cl₂) for quick, reliable instrument calibration. With a two-year shelf life and no preparation required, this non-hazardous kit ensures stable, lab-grade accuracy and consistent water quality testing results.
W**E
I would buy again
Product was as described and was only a month old so the expiration dates were far enough out that I would have a long life use for the item.
J**H
Expensive
They expire less than a year from date of receipt
R**.
SpecChek works!
This product is used to perform monthly accuracy checks required by the state of Texas for Hatch Chlorine Testers. The product arrived on time and was well packaged.
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