Fruit hardness tester or Fruit Penetrometer: used to measure the hardness of apples, pears,
watermelons, bananas and other fruits, to determine the maturity of fruits, to cultivate
good varieties, picking time, processing time, harvest storage, export transportation and other
reasonable control of time.
It is suitable for fruit research departments, fruit farms, fruit companies, universities and
other units. The instrument is small in size, light in weight, intuitive in numerical display
and easy to carry. It is suitable for fruit inspection in various fruit venues.
It can also be assembled on a special test stand, which can improve
the accuracy of testing and is suitable for professional testing departments.
Fruit Penetrometer Hardness Tester
Soft and hard fruit both can be measured with FP-503
Terminology:
Fruit firmness (P) refers to the ratio of fruit unit area (S) to the pressure
(N) of the pressure spring under test.
P=N/S
P Fruit hardness (10^5 Pa or kg/cm)
N Force exerted by a force-measuring spring on the fruit surface(N or kg)
S Fruit area of thrust surface (cm)
Using Steps
Before measurement: Turn the dial to align the drive pointer with the first calibration line
of the dial ( calibration line 0.5); Peel the fruit about 1 cm .
Measurement: Hold the hardness tester in hand, make the hardness tester perpendicular
to the surface of the fruit under test, press the test head into the fruit evenly, then drive
the pointer to start driving the indicator to rotate,
When the test head stops at the scale line (10mm), the reading indicated by the indicator is the
hardness of the fruit, and the average value is taken three times.
After measurement: Rotate the knob to reset the pointer to the initial calibration line.

Fruit hardness tester or Fruit Penetrometer: used to measure the hardness of apples, pears,
watermelons, bananas and other fruits, to determine the maturity of fruits, to cultivate
good varieties, picking time, processing time, harvest storage, export transportation and other
reasonable control of time.
It is suitable for fruit research departments, fruit farms, fruit companies, universities and
other units. The instrument is small in size, light in weight, intuitive in numerical display
and easy to carry. It is suitable for fruit inspection in various fruit venues.
It can also be assembled on a special test stand, which can improve
the accuracy of testing and is suitable for professional testing departments.
Fruit Penetrometer Hardness Tester
Soft and hard fruit both can be measured with FP-503
Terminology:
Fruit firmness (P) refers to the ratio of fruit unit area (S) to the pressure
(N) of the pressure spring under test.
P=N/S
P Fruit hardness (10^5 Pa or kg/cm)
N Force exerted by a force-measuring spring on the fruit surface(N or kg)
S Fruit area of thrust surface (cm)
Using Steps
Before measurement: Turn the dial to align the drive pointer with the first calibration line
of the dial ( calibration line 0.5); Peel the fruit about 1 cm .
Measurement: Hold the hardness tester in hand, make the hardness tester perpendicular
to the surface of the fruit under test, press the test head into the fruit evenly, then drive
the pointer to start driving the indicator to rotate,
When the test head stops at the scale line (10mm), the reading indicated by the indicator is the
hardness of the fruit, and the average value is taken three times.
After measurement: Rotate the knob to reset the pointer to the initial calibration line.