Grip Training Equipment Digital Hand Dynamometer Adjustable Electronic Grip For Students' Physical Standard Test                1. LED digital display with 20mm character height     2. Clear button settings, wear-resistant and not easy to fade     3. High-precision strain sensor     4. Fits the palm of your hand to make it easier to exert force     5. Functions: hold peak grip strength, switch/clear, scheduled shutdown, overload indication     Product Name: Electronic Grip     Measuring range: 0-90kg     Graduation value: 0.1kg     Indication error: plus or minus 1%F.S     Power supply: a 9v stacked battery     Working environment: 0Celsius-40Celsius less than 75%RH     Storage temperature: -10 degrees -50 degrees less than 75%RH     How to use:     Spread your feet naturally, stand upright, and your arms will hang down naturally. Hold the grip meter in one hand with your full strength. The number displayed on the grip meter is the grip strength value. Hold it twice and take the largest value.     Warm reminder:     The reason why grip strength is tested instead of arm strength or other parts strength is that the grip strength is more integrated than other forces such as arm strength and wrist strength. It involves a more comprehensive muscle group. To test it, it is actually a test including arm strength, wrist strength and even back strength. The overall coordination of muscles is more objective and scientific     Color:Grey / Blue     Material:Plastics          Package Contents:     1 x Digital hand dynamometer          Only the above package content, other products are not included.     Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.