There is no such thing. There are different units, depending on what exactly (what physical quantity) you want to measure.
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Yes, it is possible.
A reflectance photometer is typically used to measure reflection by detecting the intensity of light reflected off a surface. It measures the amount of light reflected by an object at specific wavelengths to determine its reflectance properties.
A colorimeter is a scientific instrument that measures the intensity of light passing through a pure sample. In biology, colorimeters are used to monitor the growth of cultures. As the culture grows, the growing medium becomes more cloudy and absorbs more light.
To find the effect of wind on water uptake by the shoot using a photometer, you would measure the rate of water uptake by the shoot in calm conditions and then when exposed to varying levels of wind. By comparing the photometer readings in both scenarios, you can determine how wind affects water uptake by the shoot. This can help understand the impact of wind on transpiration rates and plant water balance.
spectrophotometer