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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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

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KSh1960

Duties & taxes included

In stock

Sold byAmazon KenyaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📐 Measure your progress, master your recovery!

BUILT TO ENDURE - Durable plastic withstands frequent use and cleaning, maintaining readability and reliability over years.
FULL CIRCLE INSIGHT - 360-degree ISOM dial with triple scales ensures versatile and exact angle readings every time.
CRYSTAL CLEAR CLARITY - Transparent plastic design lets you align directly on joints for effortless, error-free measurements.
PRECISION MEETS PRACTICALITY - Easily measure joint range of motion with 12-inch accuracy for confident therapy tracking.
THERAPIST APPROVED ESSENTIAL - Trusted by professionals and rehab patients alike for seamless recovery monitoring and sports therapy.

The Ever Ready First Aid 12" Plastic Goniometer is a durable, transparent tool designed for precise 360-degree joint angle measurement. Ideal for physical therapy, sports rehab, and post-surgery recovery, it features a multi-scale dial and dual-unit ruler for versatile, easy-to-read assessments trusted by thousands of users.

Specifications

ASIN	B01G9AR62O
ASIN	B01G9AR62O
Best Sellers Rank	#87,194 in Health & Household ( See Top 100 in Health & Household ) #20 in Construction Protractors #586 in Activity, Health & Wellness Monitors
Brand Name	Ever Ready First Aid
Color	Multicolored
Customer Reviews	4.7 4.7 out of 5 stars (3,564)
Date First Available	May 27, 2016
Is Discontinued By Manufacturer	No
Item Dimensions	12.3 x 4.7 x 0.1 inches
Item model number	121000
Manufacturer	Ever Ready First Aid
Manufacturer	Ever Ready First Aid
Manufacturer Part Number	121000
Material Type	Plastic
Model Number	121000
Product Dimensions	12.3 x 4.7 x 0.1 inches; 2.4 ounces
Recommended Uses For Product	Sports
UPC	710465376021
Unit Count	1 Count

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