A -1.0 bar manometer, does minus bar even exist?

I'm looking for a manometer to be used to evacuate my heatpump. And then I ran into this one https://preview.redd.it/ty2jzvxh49c61.jpg?width=287&format=pjpg&auto=webp&s=507ae1083169b5ace984d634a19588570cf954b1 I though 0 bar is the absolute minimum (just as in space)? Is it just to make it "easier" to read? submitted by /u/MrReeeedigydo [link] [comments]