1) Yes, the G&G GG-HH1001B can print on concrete or cement, provided you use the **GB-001 (solvent) ink type, which is designed for non-water absorbent materials such as metal, glass, plastic and cement.
2. some slight moisture can be tolerated, but you will get the best possible results on smooth, dry surfaces. The manual points out that print quality is highly dependent on the evenness and dryness of the surface.
3 Yes, the printer is very suitable for QR codes, with or without additional text. It supports the printing of QR codes, barcodes, logos and mixed-content documents.
4 The manual does not specify a precise size limit specifically for QR codes. However, an orientation can be derived based on the following information:
- Maximum character height: up to 12.7 mm
- Maximum print length per line: 407 mm
- Up to 5 lines possible at the same time
A completely square QR code with e.g. 50 × 50 mm would probably work, but you would have to print it in several segments (overlapping or in rows) as it exceeds the maximum print height. However, this is rather unusual in handheld operation.
5 For images, the following are supported: bmp, jpeg and png, with a maximum capacity of 4800 × 150 pixels.
6. the internal memory is about 50 MB, which offers space for about 30,000 messages (e.g. texts, QR codes, etc.).
7. files are loaded via a USB stick (U-Disk), simply insert the stick with the image or text files and you can add content or install firmware updates via the touchscreen menu.