is this hard plastic? or does it bend easily?

It is pretty stiff, but will bend gently and slightly ~10-30 degrees under pressure, rather than break. But left alone, it stays straight.

What the uncertainty principle on this goniometer?

I'm not sure I understand the question. I used it to measure my knee after total knee replacement. It lets you know the degrees of where your at for the curve and when its straight. 12 years ago your knee had to be 180 for it to be straight and then they liked it around 110 for the bend. Last year when I had the other knee done you came out of surgery at 180 degrees so you only needed to measure for the bending of your knee

Will this work for elbow ?

It is designed to measure angles of joints, so although its larger size accomodates hip and knee joints, it also may be used to check elbows.

What is the radius of the ruler?

From the center pivot to the end of the arms is ~10".

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Ever Ready First Aid Plastic 12" Goniometer 360 Degree ISOM

Ever Ready First Aid Plastic 12" Goniometer 360 Degree ISOM

Product ID: 30385254

Details

Brand
Ever Ready Aid
Color
Multicolored
Item dimensions L x W x H
12.3 x 4.7 x
Material
Plastic
Recommended Uses For Product
Sports

📏12-inch precision length

🔄360° multi-scale measurement

🔍transparent for clear readings

MX$374

Duties & taxes included

In stock

Sold byAmazon MexicoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📐 Measure your recovery like a pro — don’t miss a degree!

DUAL UNIT RULER - Integrated inches and centimeters on the arm for seamless metric and imperial use.
DURABLE REUSABLE - High-quality plastic construction built to withstand repeated clinical and sports therapy use.
360 MULTI SCALE DESIGN - Three distinct scales on a rotatable head for versatile, professional-grade readings.
PRECISION RANGE TRACKING - Easily measure joint motion to track recovery progress with clinical accuracy.
CRYSTAL CLEAR TRANSPARENCY - Place directly on limbs for unobstructed, precise angle visualization.

The Ever Ready First Aid 12" Plastic Goniometer is a must-have tool for physical and sports therapy professionals, offering precise 360° joint range of motion measurements with a transparent, easy-to-read design. Featuring dual-unit rulers and a durable, reusable build, it supports accurate recovery tracking post-surgery or injury.

Specifications

ASIN	B01G9AR62O
Best Sellers Rank	#63,946 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #29 in Construction Protractors #710 in Activity, Health & Wellness Monitors
Brand	Ever Ready First Aid
Brand Name	Ever Ready First Aid
Color	Multicolored
Customer Reviews	4.7 out of 5 stars 3,567 Reviews
Included Components	goniometer
Item Dimensions	12.3 x 4.7 x 0.1 inches
Manufacturer	Ever Ready First Aid
Manufacturer Part Number	121000
Material Type	Plastic
Model Number	121000
Number of Pieces	1
Other Special Features of the Product	Reusable
Recommended Uses For Product	Sports
Special Feature	Reusable
UPC	710465376021
Unit Count	1 Count

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