IOP compensation by corneal thickness (only for NT-530) The IOP compensation can be calculated with manually entered patient's central corneal thickness. APC (Auto Puff Control) The APC provides a quieter and softer air puff for patient's more comfort. Tiltable 5.7-inch color LCD The 5.7-inch color LCD with tilting function offers easy operation even for a standing operator. 3-D auto tracking, auto shot, and auto complete (Auto complete is only for NT-530.) Features IOP compensation by corneal thickness (only for NT-530) Advanced APC (Auto Puff Control) and noise reduction for comfortable tonometry measurement Tiltable 5.7-inch color LCD for user-friendly operability 3-D auto tracking, auto shot, and auto complete