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 AAsize alkaline-manganese batteries can provide approximately 20,000 measurements. Small measuring area The measuring area is only 2 x 3 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.