ZD-2804 Digital Soil Available N-P-K Nutrient Tester（3 in 1）
Range: 0 - 1999 mg/Kg (mg/l).
Resolution: 1 mg/Kg (mg/l).
Accuracy: ±2% F.S.
Operating Temperature: 5 - 45°C (41 - 1113°F) / ATC.
Calibration: One-point ( the factory is calibrated and the user does not need to recalibrate ).
Display: LCD with illumination.
Power supply:  DC 9V Battery (L1022 Non-rechargeable battery-rechargeable ) .   
Size: Ø50.5 X 140 mm(probe section).
Weight: 80g.
Features: Automatic switch-off function: after about 5 minutes without pushing buttons,
the meter will be switched off automatically .
Used: It USES customized special metal materials as sensors to realize rapid determination of soil available
N、P、K nutrients.