Fruit Diameter Measuring Instrument
Handheld fruit diameter instrument, 0.005 mm resolution, <1% radius accuracy, 0–12.7 mm range.
Includes 5 claws, batteries & case. Optional data cable output.
Louise Corscadden, PhD
Director of Science · ConductScience
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Key Specifications
Full details →- Model fit
- Configured during quote
- SKU family
- AGR-0049
- Sizing
- Model-specific dimensions confirmed from the selected configuration
- Ordering
- Quote-reviewed before fulfillment
- Category
- Agriculture & Food Science
- Build notes
- Confirm accessories, station layout, and support needs before purchase
The fruit diameter measuring instrument is a compact, handheld device designed to measure the curvature radius and surface displacement of fruit and similarly curved specimens with high precision. It quantifies the radius of a curved surface by detecting the linear displacement of its measuring claws, delivering a direct radius readout so researchers and growers can assess fruit size, uniformity, and development without complex calculation.
The key qualifier that sets this instrument apart is its combination of fine resolution (0.005 mm) and low radius measurement error (ΔR ≤ 0.01 × R/S), making it suitable for studies where small differences in fruit geometry—across growth stages, cultivars, or treatment groups—must be reliably distinguished. Its displacement measurement error is held to ΔS ≤ 0.02 mm, and radius accuracy is better than 1%.
Typical applications include pomology research, plant-breeding trials, post-harvest quality assessment, and agronomic field studies where repeated, non-destructive measurement of individual fruit is required. The instrument operates across a working temperature range of 0 to 40 °C and is unaffected by relative humidity up to 80%, supporting both laboratory benchtop use and field conditions.
Each unit ships as a complete package including five interchangeable measuring claws, two CR2032 lithium batteries, an instruction manual, and a protective plastic storage case. Optional accessories—including USB and RS232 data cables and an external display—are available for researchers who need to log or transmit measurement data directly.
Measuring Range
- 0–12.7 mm
Display Range (Length Displacement)
- 0–13 mm
Radius Range
- 5–9999.9 mm
Resolution
- 0.005 mm / 0.0005 in
Accuracy
- 20 μm
Radius Accuracy
- <1%
Displacement Measurement Error
- ΔS ≤ 0.02 mm
Radius Measurement Error
- ΔR ≤ 0.01 × R/S (R = radius measured; S = corresponding displacement)
Power Supply
- 3 V lithium battery (CR2032)
Working Temperature
- 0–40 °C
Humidity Tolerance
- Unaffected at relative humidity ≤ 80%
Standard Configuration
- 5 measuring claws, 2 batteries, instruction manual, plastic storage case
Optional Accessories
- USB data cable, RS232 data cable, ear cover, various brush heads, external display
What measurement ranges does this instrument cover?
The instrument measures linear displacement from 0 to 12.7 mm (display range 0–13 mm) and calculates surface radius values from 5 to 9999.9 mm, accommodating fruit from small berries to large cultivars.
How accurate and precise is the radius measurement?
Resolution is 0.005 mm (0.0005 inch), accuracy is 20 μm, displacement measurement error is ΔS ≤ 0.02 mm, and radius measurement error is ΔR ≤ 0.01 × R/S, where R is the radius being measured and S is the corresponding displacement value. Overall radius accuracy is better than 1%.
What is included in the standard package?
Each instrument comes with five measuring claws, two CR2032 lithium batteries, an instruction manual, and a plastic storage case—everything needed to begin measuring immediately.
Can I connect the instrument to a computer or data logger?
Yes. USB and RS232 data cables are available as optional accessories, along with an external display, so you can record or transmit measurement data directly to a computer or data-acquisition system.
Is this instrument suitable for field use?
Yes. It is battery-powered (3 V CR2032), handheld, and rated for a working temperature range of 0 to 40 °C. It is unaffected by relative humidity up to 80%, making it practical for both laboratory and outdoor field conditions.
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