Konica Minolta



Chlorophyll Meter SPAD-502Plus

The SPAD-502Plus is a portable, non destructive measuring device for the chlorophyll content of leaves widely used to optimise the timing and quantity of fertiliser to improve crop yields.


Principal Specifications SPAD-502Plus


Chlorophyll Meter SPAD-502Plus

Measurement subject

Crop leaves

Measurement method

Optical density difference at 2 wavelengths

Measurement area

2 mm × 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


1 SPD (silicon photodiode)


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 source

2 AA-size alkaline batteries

Battery life

More than 20,000 measurements (when using new alkaline batteries under Konica Minolta test conditions)

Minimum interval between measurements

Approx. 2 seconds


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


Within ±0.3 SPAD units

For SPAD value between 0.0 and 50.0 (with no change in sample position)


Within ±0.5 SPAD units

Temperature drift

Within ±0.04 SPAD units/°C

Operating temperature/humidity range

0 to 50°C; Relative humidity of 85% or less (at 35°C) with no condensation

Storage temperature/humidity range

-20 to 55°C; Relative humidity of 85% or less (at 35°C) with no condensation

Size; Weight

78(W)×164(H)×49(D)mm、200g(excluding batteries


Warning buzzer; User compensation factor

Standard accessories

Depth stop; Strap; 2 AA-size alkaline batteries; Soft case; Reading checker

Specifications and appearance subject to change without notice.

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