Test parameter: CO2 Leaf temperature PAR Leaf chamber temperature Leaf chamber humidity Calculation: Leaf photosynthetic rate Leaf transpiration rate Cell CO2 concentration Stomatal conductance Water use efficiency Technical parameters： Air temperature: Switzerland imports high-precision digital temperature sensors, Measuring range: -20-80 ° C, resolution: 0.1 ° C, error ± 0.2 ° C Blade temperature: Platinum resistance, measuring range: -20-60 ° C, resolution: 0.1 ° C, error ± 0.2 ° C humidity: Switzerland imported high-precision digital humidity sensor, measuring range 0-100%, resolution: 0.1%, error ≤ ± 3% Photosynthetically active radiation (PAR): Silicon photocell with correction filter, measuring range: 0-3000μmol m 2 / sec, accuracy <5μmol m 2 / sec Flow: glass rotor flowmeter Leaf chamber size: standard size 55×20mm, can be customized according to customer needs Working environment: temperature 20 ° C – 50 ° C, relative humidity: 0-100% (no condensation) Power supply: DC7.4V lithium battery, can work continuously for 10 hours Data storage: 2GB SD card Display: 320 × 160 dot matrix, Chinese interface Volume: 260 × 260 × 130mm Weight: 3.25kg host; Instruction Manual