{"product_id":"hanchen-pd-meter-digital-pupil-distance-meter-pd-ruler-pupilometer-with-memory-function-ce-certificate","title":"Hanchen PD Meter Digital Pupil Distance Meter PD Ruler Pupilometer with Memory Function CE Certificate","description":"\u003cp\u003eHanchen   How to use this PD meter: It is recommended to have a second person help you while testing. 1. The measured person should sit down facing the surveyor and watch to a fix place. 2. Place it on the measured person's nose carefully. 3. The pupil centre of both eyes should be aligned with the white lines. The number displayed in the LCD screen is the pupil distance of two eyes. (Unit: mm). 4. Press the left(right) black button, it shows the distance between left(right) eye pupil and bridge of nose.  5. Repeat the steps TWO and Three times to get the average value.  Parameters Model: HE-710 PD measuring range: 44~80mm Left or right pupil distance: 22.5~41mm Power supply: 23A,12V battery ( The battery not included. It's easy to be bought at supermarket.) Power: 5W Package size: 215*122*44mm Net weight: 0.2kg Indication Error: 0.5mm Asymmetry Error: 0.5mm Rounding Erro: 0.5mm   If you require very high accuracy, this one is not recommended.  Note We provide ONE YEAR warranty for every our customer. If you have any questions, please feel free to contact us directly. We will give you a reply as soon as possible.\u003c\/p\u003e","brand":"Hanchen","offers":[{"title":"Default Title","offer_id":45203320176755,"sku":"WBHDWB07HQM6Z7H","price":72.67,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/1958\/6419\/files\/614yNXZXiAL.jpg?v=1783608150","url":"https:\/\/slickpurchase.com\/products\/hanchen-pd-meter-digital-pupil-distance-meter-pd-ruler-pupilometer-with-memory-function-ce-certificate","provider":"Slickpurchase","version":"1.0","type":"link"}