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Calcium Hardness CAL Check™ Standards - HI97720-11


The HI97720-11 Calcium Hardness CAL Check Standards provide a simple solution to calibrating and validating the compatible HI97720 portable photometer. This high quality set of standards is manufactured in our state-of-the-art facility and comes supplied with a certificate of analysis. The certificate of analysis provides the lot number, reference values, and expiration date for traceability when certifying the HI97720 photometer.

  • Supplied with Certificate of Analysis
  • Standard value of 1.50 ±0.07 mg/L CaCO3 @ 25°C
  • Reusable with long shelf life stability

HI97720-11 is a high quality set of calibration standards that allows users to validate and calibrate the calcium hardness range found in the compatible HI97720 portable photometer that has a 0.00 to 2.70 mg/L (ppm) CaCO3 range. The HI97720-11 includes one sealed “A” cuvette for zeroing the meter and one “B” cuvette that is used to validate or calibrate. The expected reading from the “B” standard is 1.50 ±0.07 mg/L CaCO3 @ 25°C. The calibration set is produced in our state-of-the-art manufacturing facility using reagent grade chemicals in a temperature controlled environment.


Supplied with Certificate of Analysis

  • Product code

  • Lot number

  • Expiration date

  • Standard value @ 25°C

  • Reference meter NIST traceable


Provided storage containers

  • Light tight

  • Protects from accidental breakage



Validation and calibration of the calcium hardness range for the HI97720 portable photometer is quick and easy with the HI97720-11 CAL Check Standards.

More Information
Package Sealed standards: 0.00 and 1.50 mg/L
Quantity 1 set
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