YLS-B Portable Plant Chlorophyll Meter

Product Introduction

The YLS-B Portable Plant Chlorophyll Meter is a handheld agricultural testing instrument designed to measure relative chlorophyll levels in plant leaves. Chlorophyll is essential for photosynthesis, and its content can provide useful information about plant nutritional status, photosynthetic performance, and growth conditions.

Using a two-wavelength optical measurement method, the YLS-B measures relative light transmittance through a leaf and calculates a chlorophyll-related SPAD value. Its compact, portable design, direct LCD readout, and rapid measurement cycle make it suitable for field inspections, greenhouse monitoring, crop research, and precision agriculture.

With a measurement range of 0.0–99.9 SPAD, onboard SD card storage, and rechargeable lithium batteries, the YLS-B helps agricultural professionals monitor plant development and make more informed decisions about fertilization, irrigation, and crop management.

Performance Features

1.Two-Wavelength Optical Measurement: Measures relative leaf light transmittance at two wavelength regions to determine a chlorophyll-related SPAD value.

2. Fast Measurement: Provides a measurement interval of less than 2 seconds for efficient plant screening and field sampling.

3. Direct LCD Readout: Displays chlorophyll measurement values on a three-digit LCD, allowing convenient on-site data checking.

4. Portable Field Design: Compact construction supports measurements in fields, greenhouses, nurseries, and research plots.

5. Broad Measurement Range: Covers 0.0–99.9 SPAD for monitoring relative chlorophyll levels across a variety of plant leaves.

6. Defined Measurement Area: Features a 10 × 10 mm measurement area for localized leaf assessment.

7.  Semiconductor Optical Sensor: Uses a silicon semiconductor photodiode to detect transmitted light.

8. Repeatable Measurements: Provides specified repeatability within ±0.2 SPAD units and reproducibility within ±0.5 SPAD units for SPAD values from 0 to 50.

9. SD Card Data Storage: Supports data storage on a 2 GB SD card for field records and subsequent analysis.

10. Rechargeable Power Supply: Uses rechargeable lithium batteries, with a typical operating availability of approximately seven days per charge under normal conditions.

 Working Principle

The YLS-B Portable Plant Chlorophyll Meter uses a two-wavelength optical concentration-difference method to estimate relative chlorophyll content in plant leaves.

Chlorophyll absorbs light differently at different wavelengths. The instrument directs light through the leaf at two selected wavelength regions and measures the transmitted light using a silicon semiconductor photodiode. By comparing the relative transmittance values, the instrument calculates a chlorophyll-related index and displays the result as a SPAD value.

The measurement is nondestructive under normal operation, allowing users to assess leaves without removing samples. Repeated measurements across different leaves or plant locations can help identify variations in chlorophyll levels and support crop nutrition assessments.

SPAD values are relative optical indices rather than direct measurements of chlorophyll concentration in mass units. Their interpretation depends on plant species, leaf characteristics, and suitable calibration or reference data.

Technical Parameters

Note: The source does not specify the exact optical wavelengths, battery capacity, number of stored records, or the conditions used to define seven days of battery availability. Confirm these details with the manufacturer when needed.

Application Scenarios

The YLS-B Portable Plant Chlorophyll Meter supports plant monitoring and agricultural research across a range of environments.

• Precision Agriculture: Monitor relative chlorophyll levels to support data-driven crop management and nutrient assessment.

• Crop Nutrition Management: Identify differences in leaf chlorophyll readings that may indicate variations in plant nutritional status.

• Field Crop Monitoring: Measure leaves directly in the field to track crop development during different growth stages.

• Greenhouse Production: Monitor plant condition in controlled growing environments and compare readings between cultivation zones.

• Forestry Research: Assess relative chlorophyll variation in leaves from different plants, species, or growing conditions.

• Plant Science Research: Collect optical chlorophyll index data for plant physiology experiments and growth studies.

• Fertilization Trials: Compare leaf SPAD readings before and after different fertilizer treatments.

• Horticulture and Nursery Management: Support routine observation of ornamental plants, seedlings, and horticultural crops.

Comparison: YLS-B Portable Chlorophyll Meter vs. Conventional Laboratory Analysis

The YLS-B is suited to rapid relative chlorophyll assessment. Direct comparisons with laboratory chlorophyll concentrations require appropriate species-specific calibration or validation.

Frequently Asked Questions

Q1: What does the YLS-B Plant Chlorophyll Meter measure?

It measures a relative chlorophyll index in plant leaves and displays the result in SPAD units. This index can help assess plant condition and support crop nutrition monitoring.

Q2: What is the measurement range of the YLS-B?

The instrument has a measurement range of 0.0–99.9 SPAD.

Q3: How quickly can the instrument measure a leaf?

The specified minimum measurement interval is less than 2 seconds, supporting rapid field screening.

Q4: Is the YLS-B suitable for different plant species?

The instrument is designed to measure leaves from various plant species. However, SPAD readings may vary with species, leaf thickness, age, and structure, so comparisons should account for these factors.

Q5: Does the instrument damage the leaf during measurement?

The optical measurement method is designed for direct, normally nondestructive leaf assessment. Users should position the leaf correctly and follow the manufacturer's operating instructions.

Q6: How are measurement results stored?

The YLS-B supports data storage using a 2 GB SD card. Confirm the supported export format and data management procedure with the manufacturer.

Q7: What is the accuracy of the YLS-B?

The specified accuracy is ±1.0 SPAD at room temperature for readings between 0 and 50 SPAD. Repeatability is within ±0.2 SPAD units, and reproducibility is within ±0.5 SPAD units over the same stated range.

Q8: How long can the instrument operate on a full charge?

The supplied specification indicates approximately seven days of availability under normal conditions. Actual operating time depends on usage frequency, standby behavior, and battery condition.

Q9: Can SPAD readings be used to determine fertilizer requirements?

SPAD readings can help assess relative leaf chlorophyll levels and support nutrient management decisions. For reliable fertilizer recommendations, readings should be interpreted alongside crop species, growth stage, soil conditions, and other agronomic information.