Is it better to choose a plastic ruler or a metal ruler? How to use it?

I have bought both materials. I bought a metal ruler at first, but its edges are sharp. I almost hurted my child's face, so I changed a plastic pd ruler. It is transparent, measurement can be clearer and more accurate. It did not come with instruction, but I can easily get the manual video from Google.

How do you use this? I need to order glasses online for myself and my children and I cannot figure this out.

I googled it, watched a YouTube video if I remember correctly. No instructions came with mine, so pretty annoying.

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Pupillary Distance Ruler for Eyeglasses

Product ID: 205810363

Details

Brand
Ultrassist
Color
Transparent
Graduation Range
1 millimeters
Material
Polyvinyl
Style
Classic Edge

📏1mm precision graduations

🔍dual monocular & binocular PD scales

🛡️transparent flexible PVC design

KD 2.83

Duties & taxes included

In stock

Sold byAmazon KUWAITDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📏 Measure Like a Pro, See the Difference Instantly!

SEE THROUGH FOR PERFECT ALIGNMENT - Transparent PVC lets you align pupils without guesswork, guaranteeing accuracy every time.
DUAL BINOCULAR PD MADE EFFORTLESS - Easily capture both single-number binocular and separate right/left monocular PD values with intuitive scales.
STEP BY STEP ENGLISH GUIDE INCLUDED - Master the measurement process quickly with a detailed PDF guide, minimizing errors and boosting confidence.
PINPOINT PRECISION IN EVERY MILLIMETER - Clear 1mm graduations ensure exact pupillary distance measurements for flawless eyewear fitting.
LIGHTWEIGHT FLEXIBLE AND BATTERY FREE - Comfortable to use and eco-friendly—no electronics, apps, or sliding parts needed.

The Ultrassist Pupillary Distance Ruler is a transparent, flexible PVC tool designed for precise measurement of pupillary distance with 1mm graduations. It supports both binocular and dual monocular PD readings, making it ideal for accurate eyeglass fitting. Lightweight and battery-free, it comes with a comprehensive English user guide to ensure professional-level results every time.

Specifications

ASIN	B0842NXQ3P
Best Sellers Rank	#69,478 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #25 in Low Vision Eye Charts
Brand	Ultrassist
Brand Name	Ultrassist
Color	Transparent
Customer Reviews	4.1 out of 5 stars 493 Reviews
Graduation Range	1 millimeters
Item Highlight	Transparent PVC design measures single or dual PD from 46–84 mm, with three scale options
Manufacturer	Ultrassist Direct
Material	Polyvinyl Chloride (PVC)
Material Type	Polyvinyl Chloride (PVC)
Model	Geeloa
Number of Items	1
Part Number	ul0034
Style	Classic,Straight Edge,Flexible
Style Name	Classic,Straight Edge,Flexible
UPC	690770572380
Unit Count	1 Count

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