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Calibration of Hardness Tester

Learn how to verify the performance of Hardness Tester used to check the hardness of tablets.


  • Take out the force gauge to be calibrated and hold vertically up.
  • Adjust the zero on the force gauge.
  • Standard Weights are then applied to the hook of force gauge and measure the tension of the spring on the force gauge.
  • When 1 kg of standard weight is applied, scale on the force gauge should also show 1 kg tension produced from the initial point where pointer is adjusted.
  • Adjust the zero on the force gauge again.
  • Follow the same procedure for other weights.
  • The test to be carried out for 1.0 kg, 2.0 kg, 5.0 kg, 10.0 kg, 20.0 kg & 30.0 kg standard weights.

Tolerance: ± 0.25 kg / ± 0.1 kg
Frequency: Once in 6 months.

Maintenance / Repair

When the instrument does not comply with the requirement specified above; the instrument should be labelled as “Out of Calibration” and should get repaired / serviced.
After repairing / servicing the instrument before taking for use, the instrument must be calibrated as per the above-mentioned procedure.


                             CALIBRATION REPORT OF HARDNESS TESTER

Reference – 
Date -

Instrument No. 

Make – 
Model –

Hold vertically up the force gauge to be calibrated. Adjust the zero on the force gauge. Apply the standard weights to the hook of force gauge and measure the tension of the spring on the force gauge.

Sr. No.Weight Applied (kg)Initial Reading on Force GaugeFinal Reading on Force GaugeDifference







Conclusion : Calibration is satisfactory / not satisfactory.

Next Calibration Due On :
Done By :
Date :
Checked By :
Date :

Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of Pharmaceutical Guidelines, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips.
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2 Comments so far : Add yours...

Sri Aanand said...

I recently came accross your blog and have been reading along. I thought I would leave my first
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edy purwanto said...

Could you give the reference of this method below or above your posts please?
because what we do is always based on reference.

Thank you so much.

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