Optical Instrument Pupil Distance Pupilometer LY-9S 22.5-41mm Digital Pd Meter LCD Display

Summary:The PD Meter is a digital precision optical instrument used to measure distance between human pupils in the process of optometry for fitting spectacles.Detailed Product Description:1, It employs precise optical structure, the line of light is very clear and precise measurement. The measurement results are displayed digitally, and the left eye and right eye measuring values are displayed separately.2, Simple and rapid measuring , and the direct PD adjustment lever are possible. Combining with the adjustable viewing distance selecting lever for measuring all kind of the viewing distances, the PD measurement is simple and precise.3, When the measuring is finished, the auto power off and memory function, enable to save the power and not to lose the data.4, It can also be used in monocular the left eye and right eye separately.Parameter:Effective range of measurement: binocular pupillary distance:45-82mmleft or right pupillary distance:22.5-41mmIndication error: 0.5mmDistance of target: 30cm - Electric Voltage:DC 3V(2pcs 5# AA battery)Power:10WWeight:0.9kgVolume:28(L)x20(w)x10(H)cm

• ACCURACY MEASURE PUPILLARY: PD Meter is a precision optical instrument used to measure distance between pupils in the process of optometry for spectacles. It features direct point-sampling and high accuracy of orientation.
• TURN OFF AUTOMATICALLY: Turns off after 1 minute or you can press a button and shut it off. It stays on and drains the batteries. Store device flat side down, it will turn off automatically.
• LED LAMP-HOUSE AND LOW POWER-CONSUMPTION DESIGN: The Design of LED Lamp-House and Low Power-Consumption Makes the Battery Life Prolonged. The Brightness of LED Is Adjustable. +2.0d Compensation for The Degree of Eyesight Is Available.
• LONG READING TIME-It does retain the readings on screen while it is on and even in memory when it is switched back on as long as the slide controls have not been moved.The didital PD Meter does have a reading which lasts approximately 10 minutes
• CAUTIONS: If a pupilometer is not used, the center of the lens may be in the wrong spot, and will cause the person to be unable to see; glasses may be fit poorly and cause physical discomfort, eye strain and fatigue, and headaches.