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New bottle style for 16oz. sizes.

H&S has added an additional bottle style to the 16 oz conductivity Standard and pH Buffer Solutions.  You may now choose from the Boston Round or Cylinder Styles. 

Please specify your preference on your next order.

CALIBRATION SOLUTION FAQ

1. What am I measuring when I measure the conductivity of my solution?
    

2. How are conductivity and TDS related?
    

3. What is the difference between micromhos and microsiemens?
    

4. Is there an expiration date on the standardizing solutions?

5. What's the difference between Boston Round and Cylinder bottles?
   
    

1. What am I measuring when I measure the conductivity of my solution?

Conductivity is the measurement of the electrolytes in a solution. It is defined as the conductance in a given volume. Conductance is the ability of the solution to conduct electric current.
 

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2. How are conductivity and TDS related?

Salts, minerals, and even dissolved gases contribute uniformly to the conductivity of a solution. This means that the conductivity can be used as an indicator of the amount of dissolved materials in a solution. TDS can be used fairly accurately when comparing the status of a single source, such as NaCl, but error can arise when trying to compare two different types of solutions. It is necessary to calibrate the meter using the same dissolved materials that are in the test solution.

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3. What is the difference between micromhos and microsiemens?

There is no difference. Micromhos is more common in the U.S., while microsiemens is more common in Europe.

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4. Is there an expiration date on the standardizing solutions?

Unopened with an unbroken seal, the solution will last one year. Opened, but placed in an airtight container, the solution will last six months. Opened and exposed to air, the solution will last one day.

Note: Standards below 100 uS will degrade at a faster rate than others due to air. The conductivity of air is approximately 120 uS; any standard lower than 120 uS will slowly rise in conductivity until it reaches a state of equilibrium. Evaporation drastically increases conductivity values.

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5. What's the difference between Boston Round and Cylinder bottles?
 

The Boston round has a wider opening but does not fit in some calibration stations.

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Note:  442 is a trademark of Myron L Company