Jamar hydraulic hand dynamometer, is a high cost and manual device that is commonly used for the evaluation of the hand grip strength (HGS) with validity and reliability. Nowadays it is thought that usage of the digital and automatic calibration dynamometers, such as Camry, would be more appropriate in the evaluation of the HGS.

This research is a cross-sectional study using the random crossover method. Purpose of the study is comparing the outcome measures of the Camry and Jamar dynamometers in healthy adult individuals and investigating the realiability and validity of the Camry usage.

Healthy adult male and female individuals aged 18 and over will be included in the study on a voluntary basis. Power analysis was performed to determine the number of people to be included in the study. The power of the test was calculated with the G*Power 3.1 program and was determined as 60 participants. Inclusion criteria of the study; Healthy adults aged 18 and over, individuals who do not have any restrictions in upper extremity functions and do not have cognitive and/or psychological problems will be included. Individuals under 18 years of age, using an assistive device, having an autoimmune disorder, pregnant individuals, and individuals with a history of hospitalization for more than three days in the last six months will not be included in the study.

Evaluation and Measurements Evaluations and measurements will be made by the same researchers as stated below. The aim of the measurements to be made is to compare the Camry and Jamar dynamometers in evaluating grip strength.

1. Patient Information and Evaluation Form 2. Camry Electronic Hand Grip Dynamometer - Measurement of Grip Force 3. Jamar Hydraulic Hand Grip Dynamometer - Measurement of Grip Force The evaluations to be applied to the participants included in the study will be recorded instantly. Each individual's grip strength will be measured with two different dynamometers (Camry Electronic and Jamar Hydraulic Hand Grip Dynamometer). Evaluations will be made bilaterally (right and left) in the upper extremity, and there will be a one-minute rest period between each repeat measurement.

1. Participant Information and Evaluation Form: This is an evaluation form that includes the patient's demographic information such as name, surname, age, gender, weight, height, body mass index and dominant upper extremity side information.
2. Camry Electronic Hand Grip Dynamometer - Measurement of Grip Strength: In the evaluation to be made with the Camry Electronic Hand Grip Dynamometer; Three different measurements will be made on bilateral upper extremities (right and left). The average of three different evaluated measurements will be taken and recorded. There will be a one-minute rest period between each repeat measurement. In the evaluations to be made, the individual's posture; feet in a comfortable position at shoulder-width distance, shoulders in neutral rotation-vertical adduction, elbow joint in 90° flexion and forearm in neutral position, wrist in 0°-30° extension and 0° to 15° ulnar deviation. After the individual's posture is established, individuals will be asked to make maximum grasping movements.

Jamar Hydraulic Hand Grip Dynamometer - Measurement of Grip Strength: In the evaluation to be made with the Jamar Hydraulic Hand Grip Dynamometer; Three different measurements will be made on bilateral upper extremities (right and left). The average of three different evaluated measurements will be taken and recorded. There will be a one-minute rest period between each repeat measurement. In the evaluations to be made, the individual's posture; feet in a comfortable position at shoulder-width distance, shoulders in neutral rotation-vertical adduction, elbow joint in 90° flexion and forearm in neutral position, wrist in 0°-30° extension and 0° to 15° ulnar deviation. After the individual's posture is established, individuals will be asked to make maximum grasping movements.

Inclusion Criteria:

• Healthy participants older than 18, without an upper extremity surgery, fracture history or any limitation of the upper extremity functions as appropriate for the inclusion criterias.

Exclusion Criteria:

• Participants who has any cognitive, psychologic or autoimmune disorder, using an assistive device, hospital stay history for more than three days within the last six months and/or pregnant were not included in the study.

The participants of this study will be healthy male and female individuals aged 18 and over who agree to participate voluntarily.