Locality Probes are devices that exist in various worlds in Honkai: Star Rail. They take on various shapes but exist for the same purpose: they're used to track down objects and people. Each Locality probe works differently. We'll run you through how to use them all below.
How to use Findie in Honkai Star Rail
Findie is a Locality Probe that you'll meet in Belobog's Underworld, and can only be used when triggered by a quest. When using this device, it's important to stay within the highlighted area of the mini-map, as the hidden object is always located within this area.
Click on the Locality Probe button (R on PC) to deploy it. The light indicates the direction of the hidden object. You can deploy up to three Findies at the same time, all of which will help point to the exact direction of the item you're looking for.
In the example above, you can see that the three Findies are pointing in a specific direction. Findie's beam will glow green when it's deployed extremely close to the hidden object, which means that the area circled above indicates the exact location of the hidden object. You'll have to deploy Findie one more time in the exact location to make the object appear.
By placing Findie in the exact location of the hidden object, a sparkling spot will appear. Interact with it to get the item!
Related: Honkai Star Rail Hide-and-Seek Trailblaze Mission guide
How to use Diting in Honkai Star Rail
Diting is a Locality Probe that you'll meet in Xianzhou Luofu. It can only be used when triggered by a quest. When using this device, it's important to stay within the highlighted area of the mini-map if applicable, as the hidden person is usually located in this area. Sometimes, Diting needs to be used to find objects without a highlighted area to guide you.
Click on the Locality Probe button (R on PC) to deploy Diting. The coil of light indicates the direction of the person you're looking for. Keep deploying Diting as you go and follow the direction of the light to find your target.
Diting can also be used to make the location of hidden objects appear in the form of glowing spots. While Diting's zone is active, interact with the glowing spots to obtain information.
For more Honkai: Star Rail tips, check out Best Three-Star Light Cones for each Path in Honkai Star Rail here on Pro Game Guides.