From the brand

Handexer Grip Strength Tester

At Handexer, we are dedicated to constructing accurate and affordable tools that are easy to use for measuring grip strength and improving the fitness of their wrists, hands, and forearms.

2-in-1 Grip Training Kit Combines 265lb Digital Dynamometer and 8-Level Silicone Exerciser, Accurate Measurement + Progressive Strength Training for All Grip Improvement Needs
FDA Registered Dynamometer with 0.1kg/0.2lb Precise Increment & Backlit LCD, Silicone Exerciser Features Non-Slip Tire Grain Surface, High Quality & Durable for Long-Term Use
Perfect for Physical Therapy, Fitness Training, Sports like Rock Climbing Gymnastics Tennis, Also Relieves Arthritis & Carpal Tunnel Pain for Office Workers and Seniors
Adjustable Grip Dynamometer for Adults & Youth, Stackable Silicone Rings Save Space & Ultra Portable, Easy to Use Anytime Anywhere for Home Gym Travel
Both Dynamometer and Grip Strengthener Come with 2-Year Warranty, Professional After-Sale Service, No Risk Purchase for Your Grip Training Journey