The Trimble GreenSeeker handheld crop sensor is an affordable, easy-to-use measurement device that can be used to assess the health - vigor - of a crop in order to make better nutrient management decisions on your farm. Use the GreenSeeker handheld to instantly take a reading of your crop health. Readings can be used to make non-subjective decisions regarding the amount of fertilizer to be applied to your crop, resulting in more effective use of fertilizer - a benefit to your financial bottom line and the environment.