How to Maintain Accurate Readings from your Thermometers & Hydrometers


fuel hydrometer











The necessity to regulate stock, by means of calculating fuel volume on a daily basis, is something that all operators should be aware of.

However, the correct handling of the thermometers and hydrometers that are used in the process of this fuel volume calculation is a practice that is often neglected.

Seeing as temperature and density are huge determinants of fuel volume, accurate readings are crucial. With this in mind, the proper handling and maintenance of measuring equipment is imperative, as any damage to these measuring instruments can impair the accuracy of your results.

We’ve put together a list to help you maintain accurate readings, by visually reminding operators of the correct handling procedures.


Determine whether or not your instrument is safe and suitable to use:

  • Check to see that there are no cracks or scratches on the glass.
  • When it comes to thermometers, you need to make sure that there aren’t any breaks in alcohol or mercury.
  • With hydrometers, you need to ensure that the line engraved on the stem is super imposed on the reference line that is on the paper scale.

Storage instructions:

  • Clean and dry your instruments immediately after use and put them into storage straight away.
  • Store your instruments in an upright position, either in their protective cases or stands.


  • In order to verify and ensure accurate readings, all equipment used should be traceable back to calibrated instruments.

We, at Rigana, realise that one of the key components in minimising stock loss is the use of quality measuring equipment. That’s why we’ve developed state-of-the-art thermometers and hydrometers that are operator-friendly and superior in accuracy.

Although the use of high-grade measuring equipment is a major factor in maintaining accurate readings, it needs to go hand-in-hand with good business practice, constant calibration and the correct tank dipping procedures.

If you are ever unsure about the precision of your instruments, don’t hesitate to call us or visit our in-house laboratory, where we offer liquid density and temperature calibration.