Spectrum Technologies SPAD 502 Plus Plus Chlorophyll Meter (2mm x 3mm)

Measurement Sample: Plant leaves

Measurement Principle: Optical density difference at two wavelengths

Measurement Area: 2mm x 3mm

Maximum Sample Thickness: 1.2mm

Insertion Depth: 12mm maximum; depth stop adjustable to depths between 0 and 6mm

Light Source: 2 LEDs (light-emitting diodes)

Receptor: 1 SPD (silicon photodiode)

Display: LCD panel showing 4-digit measurement value (-9.9 to 199.9) and 2-digit data number

Data Memory: Space for 30 data

Measurements: Automatically taken when measuring head is closed.

Power Source: 2 AA-size 1.5V alkaline-manganese

Battery Life: More than 20,000 measurements per set of 2 alkaline-manganese batteries

Minimum Interval Between Measurements: Less than 2 seconds

Accuracy: Within ± 1 SPAD* unit (at room temperature, SPAD* value between 0 and 50.0); SPAD* values of greater than 50.0 may be less accurate and will cause "*" to appear.

Repeatability: Within ± 0.3 SPAD* units (SPAD* value between 0 and 50.0)

Reproducibility: Within ± 0.5 SPAD* units (SPAD* value between 0 and 50.0)

Temperature Drift: Less than ± 0.04 SPAD* units/°C

Operating Condition: 0 to 50°C (32 to 122°F); relative humidity less than 85% at 35°C with no condensation

Storage Condition: -20 to 55°C (-4 to 131°F); relative humidity less than 85% at 35°C with no condensation

Other: Buzzer (single beep for measurement complete, series of beeps for error); function for inputting compensation value

Dimensions (L x W x D): 164 x 78 x 49mm

Weight: 200g (without batteries)

Standard Accessories: Sliding depth stop; carrying strap; soft case; 2 AA-size batteries; reading checker

*SPAD values are defined by Konica Minolta to indicate the relative amount of chlorophyll present in plant leaves. Specifications subject to change without notice