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Tablet Hardness Tester

The Stokes Tablet Hardness Tester Model 539 is an indispensable tool for tablet manufacturers, designed to accurately measure the hardness of tablets. This precision instrument addresses the common issue of variations in weight and thickness in tablets compacted from a single granulation. Such variations can affect tablet density and, consequently, their hardness. With the Model 539, users can directly measure the hardness of tablets in terms of the kilogram force required to crush them. This accurate measurement allows for the optimization of machine pressures, significantly reducing wear on punches and dies, and lowering overall tooling costs. By replacing subjective methods like finger sensitivity with this reliable, easy-to-use device, tablet makers can ensure consistent tablet quality while enhancing their production efficiency.


The Stokes Tablet Hardness Tester Model 539 is an essential instrument in the realm of tablet manufacturing, offering precision and reliability in measuring tablet hardness. This innovative tool accurately gauges the kilogram force needed to crush tablets, ensuring consistent quality and uniformity across production batches. Designed to accommodate various tablet sizes, with adaptability for larger diameters and higher pressures, this tablet hardness tester transforms the way hardness is assessed in the manufacturing process. By providing objective and accurate measurements, it optimizes machine settings, reduces wear on equipment, and leads to significant cost savings in tooling. The Model 539 represents a reliable, efficient, and economically beneficial addition to any tablet production line, ensuring high-quality standards are consistently met.

Main Benefits

  • Precise Hardness Measurement: Measures tablet hardness in terms of kilograms of pressure required to crush the tablet.

  • Versatile Tablet Compatibility: Standard unit tests tablets from the smallest size to ¾ inch diameter and a maximum thickness of 1/3 inch.

  • Ease of Use: Simple and user-friendly design for quick and accurate readings.

  • Adaptable to Larger Tablets: Can be equipped with special parts for testing larger diameter tablets at higher pressures.

  • Objective Testing Method: Eliminates the need for subjective guesswork methods like finger sensitivity.

  • Consistent Tablet Quality: Helps in maintaining the desired physical characteristics of the tablet by accurate hardness measurement.

  • Enhanced Production Efficiency: By determining the actual hardness needed, machine pressures can be optimized, reducing mechanical wear.

  • Reduced Operational Costs: Lower punch and die wear lead to decreased tooling costs.

  • Increased Process Control: Allows correlation of tablet hardness with manufacturing method and composition.

  • Affordable Solution: Requires only a modest investment, offering high value for its cost.

  • Improved Safety and Reliability: Provides a more reliable and safer method for testing tablet hardness compared to manual methods.

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