brand new and high quality Features: Made of high quality ABS, it is solid, durable and high performance, long service life. High precision PD ruler with clear optical lines, can be easily operated and measure accurately and quickly. It can measure left or right monocular,and display the results of two eyes separately on LCD screen. And the ruler will turn off automatically when it is set level, energy saving. With the memory function, you do not need to worry losing data. Pupilometer only, other accessories demo in the picture is not included! Specification: Powered by: 1 x GP23A Battery (Not included) Material: ABS Length: app.19cm/7.48in Color: White Quantity: 1 Pc Instructions: Put the tester over your nose, as close to your eyes as possible, then find the middle of your pupils in a mirror, read the line closest to the middle of the pupils. Then the number displayed on the LCD screen is your pupil distance(Unit:mm). Please keep your eyes looking straight ahead during the measurement. If you are a tester, please keep looking at the nose of your tester during the measurement. Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Pupilometer