Video Lens Calculator is a tool for windows that can help you choose your lens.
The most common Vertical / People Counting application of the Lens Computer is to determine the correct focal lenght lens to use for a given situation. Multiple cameras can be used when it is necessary to cover extra-wide doorways for people-counting and overhead analytics.
ProKon - is an amazing engineering calculator with multiple conversion and calculation modules.
The Relief Data is a tool created by the Philippine's Bureau of Internal Revenue
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