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.Duty & taxes paid at delivery

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Ever Ready First Aid Plastic 12" Goniometer 360 Degree ISOM

Product ID: 282050072

Details

Brand
Ever Ready Aid
Colour
Multicolored
Number of pieces
1
Recommended uses for product
Sports
Special features
Reusable

📏12-inch precision arm

📐1° increment accuracy

🔄360° full rotation

KSh5177

Duties & taxes included

In stock

Sold byAmazon KenyaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📏 Measure progress like a pro — because every degree counts!

EYE FRIENDLY SIZE - Generous 12-inch length offers easy readability, reducing strain during critical evaluations.
DURABLE REUSABLE - High-quality plastic construction built to withstand repeated use in clinical or sports settings.
TRUSTED BY THOUSANDS - 4.7-star rating from over 3,200 users proves reliability and professional endorsement.
DUAL MEASUREMENT SCALES - Inches and centimeters on the arm for versatile, professional-grade assessments.
PRECISION AT EVERY ANGLE - 360-degree protractor coverage ensures exact joint measurements for confident recovery tracking.

The Ever Ready First Aid 12" Plastic Goniometer offers precise 360-degree measurement with 1-degree increments, dual metric and imperial scales, and durable reusable plastic construction. Ideal for sports and rehabilitation professionals tracking joint mobility, it combines accuracy with ease of use, backed by thousands of positive reviews.

Specifications

ASIN	B01G9AR62O
ASIN	B01G9AR62O
Brand	Ever Ready First Aid
Customer Reviews	4.7 4.7 out of 5 stars (3,301)
Customer reviews	4.7 4.7 out of 5 stars (3,301)
Date First Available	2 July 2016
Is Discontinued By Manufacturer	No
Item model number	121000
Manufacturer	Ever Ready First Aid
Product Dimensions	31.24 x 11.94 x 0.25 cm; 68 g
Units	1 Count

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