["brand new and high quality\nFeatures:\nMade of high quality ABS, it is solid, durable and high performance, long service life.\nHigh precision PD ruler with clear optical lines, can be easily operated and measure accurately and quickly.\nIt can measure left or right monocular,and display the results of two eyes separately on LCD screen.\nAnd the ruler will turn off automatically when it is set level, energy saving.\nWith the memory function, you do not need to worry losing data.\nPupilometer only, other accessories demo in the picture is not included!\n\nSpecification:\nPowered by: 1 x GP23A Battery (Not included)\nMaterial: ABS\nLength: app.19cm/7.48in\nColor: White\nQuantity: 1 Pc\n\nInstructions:\nPut 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.\n\nNote:\nNo retail package.\nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage includes:\n1 x Pupilometer"]