Question about chain tensioners from a newcomer

Hello everybody, my wife and I want to look at a 9-5 of 2000 with the 2.3 L 170hp engine over the next week. Running speed approx. 160,000km Since I have very little experience with control chains, I have read in here a bit. Can I check the chain tensioner somehow at the used car check? This is currently the only crux point of our uncertainty. Greeting from Lake Constance Thorsten