The Lutron FR-5120 is a professional-grade digital fruit hardness tester designed for precise measurement of fruit firmness across various types of produce. With a high capacity of 20 kg and exceptional resolution of 0.01 kg (10 g), this ISO-9001 and CE certified instrument provides reliable data for fruit quality assessment, harvest timing decisions, and storage optimization. Featuring interchangeable tips, digital display with backlight, and advanced measurement functions, the FR-5120 is an essential tool for fruit research departments, commercial growers, agricultural universities, and quality control professionals.

Key Features & Benefits

• High Precision Measurement - 20 kg capacity with 0.01 kg (10 g) resolution for accurate hardness testing


• Versatile Application - Suitable for most fruits including apples, pears, strawberries, grapes, and both large/hard and small/soft varieties


• Multiple Measurement Tips - Includes 4 interchangeable penetrometer tips (3 mm, 6 mm, 8 mm, and 11 mm) for different fruit types


• Peak Hold Function - Automatically captures and displays maximum force reading for easy measurement


• Multi-Unit Display - Select between kg, lb, or Newton units according to preference


• Load Cell Technology - Advanced sensor provides high precision and consistent readings


• Backlit LCD Display - Large 5-digit screen with illumination for clear reading in any environment


• Dual Response Modes - Fast (0.2 second) or slow (0.6 second) update time options


• Zero/Tare Function - Works in both normal force and peak hold modes


• Positive/Reverse Display - Adjustable screen orientation for comfortable viewing


• Computer Connectivity - RS-232 serial interface for data logging (USB adapter optional)


• Overload Protection - Built-in safeguards protect the sensitive load cell mechanism


• Portable Design - Handheld operation with mounting holes for optional test stand attachment


• Complete Kit - Includes hardness tester, 4 penetrometer tips, and hard carrying case

Technical Specifications - Measurement Capabilities Lutron FR-5120 Digital Fruit Hardness Tester

Recommended Measurement Ranges Lutron FR-5120 Digital Fruit Hardness Tester

Physical Specifications Lutron FR-5120 Digital Fruit Hardness Tester

Measurement Principle

The FR-5120 operates on the fundamental principle that fruit hardness can be expressed as the pressure a unit area can withstand. This is calculated using the formula: Lutron FR-5120 Digital Fruit Hardness Tester P = N / S Where:

• P = Hardness value of fruit (kg/cm²)


• N = Pressure of dynamometer (N, kg, lb)


• S = Area of pressure (m², cm²)

Agricultural Research Lutron FR-5120 Digital Fruit Hardness Tester

• Ripeness Assessment - Determine optimal harvest timing based on objective hardness measurements


• Cultivar Evaluation - Compare firmness characteristics across different fruit varieties


• Storage Studies - Monitor changes in fruit firmness during storage periods


• Post-Harvest Research - Evaluate the effects of various treatments on fruit texture


• Plant Breeding - Select for improved firmness traits in breeding programs