Universal tablet holder with a practical clamping mechanism for all tablets with a size of approx. 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 vegetable raw materials. The clamping range of the tablet PC holder is between 158 and 280 mm. The holder is also 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 a secure hold and eliminate unwanted vibration noises. The functioning of the operating controls on the device is not affected. An adjustable mounting bracket with felt padding provides additional security when the tablet holder is oriented vertically, preventing the tablet PC from falling out even under heavy use. The holder can be swivelled and tilted, allowing each user to position it individually. The swivel movement can be adjusted from easy to difficult via a clamping screw. Of course, the tablet holder can be rotated between portrait and landscape format quickly, while independent turning will be prevented. The holding arm with clamp is suitable for mounting onto tube diameters up to 30 mm.