phtometer is based on advanced electronic optical technology. The aim of our product is to make the hardware reliable and the software simple and convenient. Our Phtometer was highly praised by many customers during its probation period in hospitals. We can also do OEM. We use English display system completely for PHTOMETER . It has prompting for each operation, which is more convenient for the users. Even the first-time users can learn the operations of PHTOMETER quickly.