The GESERCO TANTestâ„¢ Test Kit: A simple, now more efficient and safer solution to determine the Acid Number of any oils

19 / 03 / 2025

Dear clients and partners,

GESERCO is proud to introduce the latest version of its TANTest™ Test Kit, a portable mini laboratory specifically designed to measure the Acid Number (AN) of oils directly on site. Now delivered with a lightbox and toluene-free, it is safer to use while delivering even faster, more reliable, and accurate results.

Why monitor the Acid Number of oils?

Over time oil oxidates and its properties decline, leading to serious mechanical issues in the machinery:

  • Corrosion of metal components
  • Gumming and clamping of lubricated parts
  • Production of glaze and sludge in the circuitry

By measuring the evolution of the oil Acid Number with the GESERCO TANTest™ Test Kit, the oil oxidation and ageing is easily monitored allowing for its replacement before a problem occurs.

A simple and efficient method

  • The colorimetric test method can be implemented by anyone. No need to be a specialist!
  • Quick test result within minutes
  • High sensitivity to 0.05 mg KOH/g
  • Interpretation guide included: No training required

New: The test is now toluene-free for safer use

With their new toluene-free formulation, the test chemicals provide greater user safety and reduced environmental impact, without compromising test performance.

New: The kit includes a lightbox to facilitate test result evaluation

To improve the operator’s experience, the TANTest™ Test Kit now includes a lightbox. This innovative tool makes it easier to detect subtle color changes in the oil sample and evaluate when the endpoint of the reaction has been reached. By enhancing color perception, the lightbox ensures a more reliable Acid Number measurement, providing operators with easier use and greater repeatability.

Discover the TAN Test Premium™ Kit: A cost-effective and optimized solution

As an alternative to the traditional GESERCO TANTest™ Test Kit, the new TAN Test Premium™ Kit offers a simplified and cost-effective solution while maintaining high accuracy, guaranteeing reliable Acid Number test results at reduced cost.


At GESERCO, we are committed to providing innovative, safe, and efficient solutions to support your maintenance operations. We appreciate your trust and look forward to helping you achieve optimal lubricant performance.

The GESERCO Team

Contact Us

Have questions or need assistance? Our team is here to help. Reach out to us at contact@geserco.fr.

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