Which biometric technology is NOT currently used in commercial plant monitoring systems for natural product cultivation?

The natural products industry is increasingly using advanced technology to monitor plant health and optimize growth conditions. Sophisticated sensors now allow farmers and conservationists to track vital signs in plants similar to how we monitor human health metrics. This poll tests your knowledge about cutting-edge product innovations that are revolutionizing how we interact with the natural world.

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Electrical conductivity sensors that measure nutrient uptake through plant stems
Acoustic monitoring systems that detect ultrasonic emissions from water-stressed plants
Neural implants that directly interface with plant nervous systems to analyze growth patterns
Hyperspectral imaging cameras that detect early signs of disease before visible symptoms appear