When looking for a tempered glass screen protector for your Samsung Galaxy Tab A8, it's important to ensure compatibility with your specific tablet model. However, as of my knowledge cutoff in September 2021, there is no Samsung Galaxy Tab A8 released by that time. The latest Galaxy Tab A series model available was the Galaxy Tab A7.

Nevertheless, if a Samsung Galaxy Tab A8 has been released since then, you can find tempered glass screen protectors for tablets in various online and offline stores. Here's a general guide on how to choose a suitable tempered glass screen protector:

1. Compatibility: Ensure that the screen protector is specifically designed for the Samsung Galaxy Tab A8 model, considering any variations in screen size or dimensions.

2. Thickness and Hardness: Look for a screen protector with a thickness of around 0.3mm or 0.4mm, as this provides a good balance between protection and touch sensitivity. Additionally, choose a protector with a high hardness rating (9H) to guard against scratches and minor impacts.

3. Oleophobic Coating: A good screen protector should have an oleophobic coating to resist fingerprints and smudges, making it easier to clean.

4. Bubble-Free Installation: Check if the screen protector comes with installation tools, such as cleaning wipes, dust removal stickers, and alignment guides, to ensure a bubble-free installation.

5. Case Compatibility: If you plan to use a tablet case or cover, ensure that the screen protector doesn't interfere with its fitting.

It's recommended to search for screen protectors from reputable brands or read reviews from other customers to get an idea of their quality and user experiences. Additionally, check with the manufacturer or authorized retailers for any official screen protector recommendations for the Samsung Galaxy Tab A8.