![](https://play-lh.googleusercontent.com/a/ACg8ocIYCehkeGrVyJOan_3Om1jJQoZN892sjJqeeEgv98sOz180QVQf=s32-mo)
MyName
I don't know what everyone's so happy about with this app. It doesn't do anything. It just displays a little ruler picture on screen. Nothing else.
1 person found this review helpful
![](https://play-lh.googleusercontent.com/a-/ALV-UjWpOxDPTH_hYdAROMP2wwe51pvvhjpEzZJr8w_5YSUsOT4YMBiq=s32)
Folco Nolte
Samsung S9... initial ruler was relatively precise... about 1mm difference on 10cm. Calibration made it terribly wrong. 1.1cm difference on 11cm. Since it's nothing else but a ruler I deinstalled it again.
33 people found this review helpful
![](https://play-lh.googleusercontent.com/a-/ALV-UjV9bvCd9Tv8QSdn9jb2Pylov--CsaDRSSX0IiOG2jBWvHWaNUBV2A=s32)
Jerry Warner
You can use the calibration with a ruler to get this pretty exact. In my case .756 was the magic number.
30 people found this review helpful