Name: Chlorophyll Tester Model: TYS-4N Charger voltage: 100-240V Measuring time: 3 seconds Measuring range: Chlorophyll: 0.0-99.9SPAD Nitrogen content: 0.0-99.9MG/G Leaf surface humidity: 0-.99.9RH% Leaf surface temperature: -10-99.9°C Measuring area: 2*2mm Measurement accuracy: Chlorophyll: within±2.0 SPAD units (at room temperature, the SPAD value is between 0-50) Nitrogen content:±5% Leaf humidity:±5% Leaf temperature:±0.5& 8451; Repeatability: Chlorophyll: within±0.3 SPAD unit (SPAD value is between 0-50) Nitrogen content:±0.5 unit Leaf humidity:±0.5 unit Leaf temperature:±0.2& 8451; Measurement time interval: less than 3 seconds Data storage capacity: 32KB Power supply: 4.2V rechargeable lithium battery Battery capacity: 2000mAh Working and storage environment: -10~50& 8451; ≤85% relative humidity