Hansatech Instruments Limited is located in rural Norfolk, UK and specialises in the design, manufacture and worldwide sales of scientific instruments for use in teaching and research projects in over 100 countries worldwide. We specialise in the areas of oxygen measurement for determination of photosynthesis and cellular respiration efficiency and optical measurement techniques such as chlorophyll fluorescence, reflectance and absorption spectroscopy to determine the photochemical efficiency ( "vitality" ) of plant material and/or the presence of environmental or man-made stress in plant, algae, macroalgae, moss and lichens in all environments such as field crops, ecology investigations, arboriculture, nursery production, plant breeding selection and also under laboratory conditions