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The main issue these units have is that they have an internal battery soldered on the main board.  This battery has a life of 10-15 years.  We are one of the only dealers nationwide that replaces the chip with a new chip/battery and a socket for easy exchange in the future.  Our units will last longer and be more reliable than others on the market. The Humphrey FDT Perimeter uses Welch Allyn Frequency Doubling Technology to provide a clinically verified, fast and affordable means of detecting early visual field loss. The perimeter is the ideal glaucoma screening device because it conducts supra-threshold testing in only 35 seconds per eye. Remarkably affordable, the FDT Perimeter brings glaucoma testing to any size practice, even the smallest. In addition to fast supra-threshold testing it also conducts full threshold testing complete with statistical analysis in about 4 minutes. Tests include:  C-20 in both screening AND threshold, N-30 in threshold This unit also comes with Viewfinder 2.0 software and a serial to USB cable which is compatible with Windows 10. Includes FDT unit, power cable, digital manual, Viewfinder software, serial to USB cable, patient response button. Clean optics New battery Viewfinder 2.0 software (Windows 10 compatible) serial to USB cable 6 month warranty included- parts and labor at our office.  Call us for details Due to the high demand for these units we will be shipping 5-7 working days after ordering.  Please call if you have any questions.