Universal tablet holder with a practical clamping mechanism for any tablet with an approx. size of 254-406 mm (10"-16"). The tablet holder is made of bio-based plastic. These plastics contain a proportion of over 50% up to 100% of renewable plant-based raw materials. The clamping area of the tablet holder is between 158 and 280 mm. In addition, the holder is particularly suitable for the use of tablets with a protective cover or case with a thickness of up to 20 mm. The overlapping clamping jaws with integrated rubber pads ensure secure positioning and eliminate unwanted vibration noises. Functioning of the devices operating controls is still maintained. An adjustable mounting bracket with felt padding provides additional safety if the tablet holder is tilted. This prevents the tablet PC from falling out, even under demanding operational conditions. The holder is suitable for pivoting and tilting which allows for any user to adjust it respectively. Horizontal pivoting can be adjusted from tight to loose movement via clamping screw. The tablet can, of course, easily be rotated between portrait and landscape format, while independent turning will be prevented. The holding arm with clamp is suitable for mounting onto tube diameters up to 30 mm.