Jamar Hydraulic Hand Dynamometer

Introduction

The Jamar Hydraulic Hand Dynamometer is a precision instrument designed for accurate and repeatable measurement of isometric grip force. It is widely used in rehabilitation, physical therapy, and occupational therapy settings for routine screening of grip strength and for evaluating hand trauma and dysfunction. This manual provides comprehensive instructions for the proper setup, operation, maintenance, and troubleshooting of your dynamometer.

The device features an adjustable handle to accommodate various hand sizes and a dual-scale readout that measures grip force in both pounds and kilograms. A peak hold needle retains the highest reading until manually reset, ensuring precise data collection.

Package Contents

Upon opening the package, verify that all components are present:

• Jamar Hydraulic Hand Dynamometer (Model 12-0600)
• Carrying/Storage Case
• Certificate of Calibration
• User Manual (this document)

Setup

Before first use, ensure the dynamometer is properly prepared.

1. Handle Adjustment

The dynamometer features a 5-position adjustable handle to fit various hand sizes and grip preferences. To adjust the handle position:

1. Locate the adjustment mechanism on the side of the dynamometer.
2. Carefully pull or push the handle to select one of the five available positions. The positions range from 1.375 inches to 3.375 inches.
3. Ensure the handle is securely locked into the desired position before use.

Image 1: The Jamar Hydraulic Hand Dynamometer, illustrating its design and the adjustable handle mechanism. This view highlights the instrument's ergonomic shape and the components involved in setting the grip width.

2. Initial Calibration Check

Your dynamometer comes with a Certificate of Calibration. It is recommended to review this certificate to understand the device's factory calibration status. While user calibration is not typically required before initial use, regular professional calibration is essential for maintaining accuracy.

Operating Instructions

Follow these steps to accurately measure grip strength using the Jamar Hydraulic Hand Dynamometer.

1. Prepare the Subject: Ensure the individual is seated comfortably with their elbow flexed at 90 degrees, forearm neutral, and wrist between 0 and 30 degrees of extension.
2. Adjust Handle Position: Select the appropriate handle position for the individual's hand size (refer to "Setup" section).
3. Reset Peak Hold Needle: Before each measurement, ensure the peak hold needle on the gauge is reset to zero. This is typically done by rotating a small knob or pressing a button near the gauge face.
4. Instruct the Subject: Ask the individual to squeeze the dynamometer with maximum effort for approximately 3-5 seconds. Encourage a smooth, sustained squeeze rather than a sudden jerk.
5. Read the Measurement: After the squeeze, the peak hold needle will indicate the maximum grip force achieved. Read the value from the dual scale, which displays measurements in both pounds (lbs) and kilograms (kgs). The maximum capacity is 200 lbs or 90 kgs.
6. Record Data: Document the reading accurately.
7. Repeat Measurements: For reliable results, it is common practice to take multiple readings (e.g., three trials) and use the average or the highest value. Allow for a brief rest period between trials.

Image 2: A person demonstrating the correct way to hold and squeeze the Jamar Hydraulic Hand Dynamometer during a grip strength test. The image clearly shows the gauge displaying the force measurement.

Maintenance

Proper care and maintenance will ensure the longevity and accuracy of your Jamar Hydraulic Hand Dynamometer.

• Cleaning: Wipe the dynamometer with a soft, damp cloth after each use. For disinfection, use a mild disinfectant solution and wipe dry immediately. Avoid harsh chemicals or abrasive cleaners.
• Storage: Store the dynamometer in its provided carrying/storage case when not in use. Keep it in a dry environment, away from extreme temperatures and direct sunlight.
• Avoid Dropping: The instrument is a precision device. Avoid dropping it or subjecting it to strong impacts, as this can affect its calibration and internal mechanisms.
• Calibration: Regular professional calibration is recommended to maintain accuracy. Refer to the manufacturer's guidelines or a certified calibration service for recommended intervals.

Troubleshooting

If you encounter issues with your dynamometer, refer to the following common problems and solutions:

For problems not listed here or if solutions do not resolve the issue, please contact customer support.

Specifications

• Model Number: 12-0600
• Capacity: 200 lbs (90 kgs)
• Measurement Units: Pounds (lbs) and Kilograms (kgs)
• Handle Positions: 5 (ranging from 1.375" to 3.375")
• Material: Alloy Steel, Plastic
• Color: Silver
• Product Dimensions: 4 x 8 x 13 inches
• Item Weight: 3 Pounds
• Manufacturer: Fabrication
• Date First Available: September 16, 2003

Warranty Information

The Jamar Hydraulic Hand Dynamometer (Model 12-0600) typically includes a one-year warranty from the date of purchase, covering manufacturing defects. Please refer to the warranty card included with your product or contact the manufacturer for specific terms and conditions. Keep your proof of purchase for warranty claims.

Support

For technical assistance, calibration services, or warranty inquiries, please contact Jamar customer support or visit their official website. Contact information can typically be found on the product packaging or the manufacturer's website.

Note: Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition. This product is a medical device for measurement and evaluation purposes.