CHLOROPHYLL METER
SPAD-502Plus
A lightweight handheld meter for measuring the chlorophyll content of leaves without causing damage to plants.
The SPAD-502Plus is  a compact meter
Designed to help users improve crop quality and increase crop yield by providing an indication of the amount of chlorophyll present in
plant leaves. The chlorophyll content of plant leaves is related to the condition of the plant, and thus can be used to determine when
additional fertilizer is necessary. By optimizing nutrient conditions, healthier plants can be grown, resulting in a larger crop yield of
higher quality.
Wheat, Rice, Corn, Cotton and beyond
The SPAD-502Plus serves in a wide variety of plant applications. Through its history, the SPAD series has established itself as a leading brand
in chlorophyll measurement across the world. It has been serving researchers and grower, enabling them to perform field tests quickly
and easily. The SPAD series has been used for various kinds of plants and its applications are still growing.
Features
Trend graph display
Changes in measurement data over time can be seen, and abnormal values can be noticed at a glance.
Compact and lightweight for portability
The SPAD-502Plus is small enough to fit in a pocket and is extremely lightweight (only 200 g) so it can be easily taken anywhere.
Quick, easy measurements
Measurements are taken by simply inserting a leaf and closing the measuring head. It is not necessary to cut the leaf, so the same leaf
can be measured throughout the growing process.
Water-resistant
The SPAD-502Plus is water-resistant (IPX-4), so it can be used outside even in the rain.
*It is not immersible, and should not be cleaned with water.
Low power consumption
The SPAD-502Plus uses LED light sources, resulting in extremely low power consumption. One set of two AA-size alkaline-manganese
batteries can provide approximately 20,000 measurements.
Small measuring area
The measuring area is only 2x3 mm, allowing measurements of even small leaves. A sliding depth stop is included for accurate positioning
on sample leaves.
High accuracy
High measuring accuracy (+/-1.0 SPAD unit for rice-plant leaves) allows close examination of growing conditions.
Data memory
The SPAD-502Plus has memory space for 30 measurements. Data in memory can be recalled or deleted at a later time, and the average
value of all data in memory can be automatically calculated.
Reading checker
A reading checker enables users to check that the SPAD-502 is functioning correctly and providing accurate readings.
Specifications
Measurement subject	Crop leaves
Measurement method	Optical density difference at 2 wavelengths
Measurement area	2 mm x 3 mm
Subject thickness	1.2 mm maximum
Subject insertion depth	12 mm (with stopper having position adjustable from 0 to 6 mm)
Light source	2 LED elements
Receptor	1 SPD (silicon photodiode)
Display	LCD panel showing 4-digit measurement value (values shown to first decimal place) and 2-digit number of measurements; Trend graph of values in memory can also be shown.
Display range	-9.9 to 199.9 SPAD units
Memory function	Memory capacity for up to 30 values; Calculation/display of average of data in memory also possible
Power	2 AA-size alkaline batteries
Battery performance	More than 20,000 measurements (when using new alkaline batteries under Konica Minolta test conditions)
Minimum measurement interval	Approx. 2 seconds
Accuracy	Within +/-1.0 SPAD units (for SPAD value between 0.0 and 50.0 under normal temperature/humidity) “*” added to display when measurement exceeds 50.0 SPAD units
Repeatability	Within +/-0.3 SPAD units	For SPAD value between 0.0 and 50.0 (with no change in sample position)
Reproducibility	Within +/-0.5 SPAD units
Temperature drift	Within +/-0.04 SPAD units/๐C
Operation temperature/ humidity range	0 to 50๐C; Relative humidity of 85% or less (at 35๐C) with no condensation
Storage temperature/ Humidity range	-20 to 55๐C; Relative humidity of 85% or less (at 35๐C) with no condensation
Size (WxHxD), Weight	78 x 164 x 49 mm, 200 g (excluding batteries)
Other functions	Warning buzzer; User compensation factor
Standard accessories	Depth stop; Strap; 2 AA-size alkaline batteries; Soft case; Reading checker