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What is Dynamometer used for?

Hand dynamometers are instruments that are used to test the hand grip strength. They are also used for a comparative measurement in left and right hands. Any type of hand trauma or dysfunction can be assessed with the help of these devices. Also the effectiveness of treatment can be judged during the period of recovery. Modern dynamometers come equipped with features like a digital display. Many types of dynamometers exist including Strain Gauge Dynamometer or Push-Pull Dynamometer, Hydraulic Gauge Dynamometer and Pneumatic Dynamometer. These devices can also be used to measure strength of arm, back or leg in order to evaluate the physical performance. 

At HPFY, we carry dynamometers that are very user-friendly and ensure reliability. We supply grip strength testers from top brands like Baseline, Janmar, etc. Check out our selection of hand dynamometers that measure grip strength and pinch strength and give accurate readings.

Why is it necessary to measure Grip Strength?

Grip strength is used to evaluate many health-related conditions. Research has shown a strong relationship between grip strength and an individual's health condition. Grip strength indicates the following:


Hand Dynamometer types

1. Hydraulic Gauge Dynamometer

It is the most commonly used of all types of dynamometers. These machines are accurate and reliable. They consist of a plastic or metal grip that the patient holds and compresses. The result is displayed via a gauge or a digital display.

2. Pneumatic Dynamometer

These dynamometers contain a ball at the end of the tube which the patient is required to squeeze based on which the measurement is taken and displayed.

3. Strain Gauge Dynamometer

These instruments are more sensitive and are basically designed for people with a weak or frail grip. These dynamometers are used for patients with certain neuromuscular disorders.

4. Push-Pull Dynamometer

These machines measure the force exerted through a push or a pull. Static/isometric or dynamic forces are used for measurement. Lifting capacity, push or pull strength can be tested using these dynamometers. 

How to measure grip strength using a Dynamometer?

  1. Hold your arm with your elbow flexed at a 90-degree angle.
  2. Squeeze the dynamometer with maximum isometric effect maintaining it for 5 seconds. No other body movements are allowed.
  3. Apply grip force smoothly without any jerking motion.
  4. Repeat twice more, giving 30 seconds rest in between.
  5. Repeat the same procedure for the other hand. 
  6. Your grip strength is the mean value of the three readings.

How to calibrate the Grip Strength Tester?

The accuracy of the results from a dynamometer can be affected by prolonged usage or leakage in the hydraulic system. The dynamometer needs to be calibrated periodically to ensure accurate and reliable results.

Some dynamometers can be easily calibrated, some others may require to be sent back to the manufacturer, or some may not be able to be calibrated at all. If the equipment produces consistent results with repeated tests, then we can consider it reliable. Though the equipment is reliable, we cannot say it measures accurate strength. By using known weight, you can check both reliability and accuracy.

Your physical therapist or occupational therapist will measure your grip strength with a hand dynamometer using the following steps:

Where to buy a Dynamometer online?

HPFY brings to you a wide range of dynamometers including the B&L Precision Hydraulic Hand Dynamometer, Baseline Back-Leg-Chest Dynamometer, Baseline Hydraulic Push-Pull Dynamometers and many more from top manufacturers like Chattanooga Group , Fabrication Enterprises, Lafayette Instruments etc. at best prices and attractive discounts.

Read more about the Handgrip Dynamometer

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Frequently asked questions

Dynamometers are helpful in assessing the strength in routine screenings, and to evaluate patients with hand dysfunction or trauma at the initial level. These medical devices help medical practitioners to determine how their patients are responding to ongoing therapy or treatment.

Types of Dynamometers

Hydraulic Gauge Dynamometer - features a curved plastic or metal grip that patients hold and squeeze.

Pneumatic Dynamometer - It utilizes a rubber squeeze ball on the end of a tube, pneumatic dynamometers require the patient to squeeze the ball and this force is measured by a gauge at the other end of the tube.

Myogrip/Strain Gauge Dynamometer – also known as strain gauge dynamometer is more sensitive and specifically designed to measure grip strength for patients who are weak, frail and present a lighter grip.

Push-Pull Dynamometer - This type of dynamometer measures exerted force through pushing or pulling, often using static/isometric and dynamic forces.

Grip strength is expected to be different between the left and right hands. Generally the dominant hand will be stronger. The non-dominant hand usually scores about 10% lower. When you test hand grip strength, you could either test both hands and average the score, or test everyone on the same side, or test everyone on their dominant side. There is no right and wrong way, whatever method suits the specific purpose will work for you.

It may be difficult for a child's hand to grip the dynamometer well and the unit may be quite heavy to hold for a child.

The position of the arm and hand can vary in different grip strength protocols. Various positions include the elbow being held at right angles, the arm hanging by the side, and the extended arm being swung from above the head to by the side during the squeezing motion can cause differences in measurements. The best result from several trials for each hand should be recorded, with at least 15 seconds recovery time between each effort.