| Customization: | Available |
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| After-sales Service: | Yes |
| Warranty: | 1year |
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Quick and easy measurement
When measuring, simply insert the leaves and close the measuring probe, without cutting off the leaves. This allows for monitoring of specific leaves throughout the growth process of the crop, resulting in more scientific analysis results.
Trend chart display The trend of multiple sets of measured data will be displayed in the graph, and those data with significant differences can be easily identified and valued for analysis.
Waterproof function
The SPAD-502Plus has waterproof function (IPX-4), allowing for outdoor measurement work even on rainy days.
Do not immerse the instrument in water or clean it directly with water.
Lightweight and easy to carry
The SPAD-502Plus has a compact body and weighs only 200g, making it easy to fit into a pocket and take to the field for measurement.
Low battery consumption
The SPAD-502Plus uses LED lighting sources, which greatly reduces battery consumption. A set of 2 AA batteries can perform approximately 20000 measurements.
Work principle
SPAD-502Plus evaluates the relative content of chlorophyll in the current leaf by measuring the absorption rate of the leaf in two wavelength ranges.
The following figure shows the spectral absorption of chlorophyll in two leaf samples. From the graph, it can be seen that chlorophyll reaches its peak absorption in the blue region (400-500nm) and red region (600-700nm), but does not absorb in the near-infrared region.
By utilizing the absorption properties of chlorophyll, SPAD-502Plus measures the absorption rate of leaves in the red and near-infrared regions. By analyzing the absorption rates of these two regions, a SPAD value can be calculated, which is a numerical representation of the current parameter corresponding to the chlorophyll content in the leaves.
| Model | Chlorophyll meterSPAD-502Plus | |
| Test sample | Leaves | |
| Test method | Optical density difference at 2 wavelengths | |
| Test area | 2 ×3 mm | |
| Sample thickness | Max 1.2 mm | |
| Sample insert depth | 12 mm (0-6mm adjustable) | |
| Light source | 2 *LED light | |
| Sensor | 1 pcs of SPD(Silicon photodiode) | |
| Display | LCD screen display,4 digits,trend chart | |
| Measuring range | -9.9 - 199.9 SPAD | |
| Data storage | 30 groups,can calculate / display average value | |
| Power supply | 2 * 1.5V battery | |
| Battery life | 20,000 times | |
| Mini test interval | 2 seconds | |
| Accuracy | ±1.0 SPAD | |
| Repeatability | ±0.3 SPAD | 0.0 - 50.0°C SPAD same test point |
| ±0.5 SPAD | ||
| Temperature draft | ±0.04 SPAD | |
| Work temperature/humidity range | Temperature : 0 - 50°C, Humidity < 85% RH @ 35°C,no dewpoint |
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| Storage temp./humidityrange | -20 - 55°C, Relative humidity < 85% @ 35°C,no dewpoint |
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| Size / Weight | 78 (W) ×164 (L) ×49 (H) mm, 200 g | |
| Others | ALARM,User coefficient compensation | |
| Standard kits | Deep braking, hand rope, 2 No. 5 batteries, soft pack, inspection certificate | |
Q : What products can you offer?
A : We are a one-stop laboratory instrument supplier that can provide customers with products and solutions according to their needs.
Q : How long is your usual delivery time?
A : Our products are usually shipped out 5-7 days after receiving payment.
Q : What transportation methods do you support?
A : We support express delivery (DHL/FEDEX/UPS/TNT), trucks, trains, planes, and ships.
Q : What trade methods can you accept?
A : We support EXW, FCA, FOB, CFR, CPT etc
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