Screen Ruler - 测量截图的完美像素尺子

This exactly what I needed to measure the distance between two isobars on a weather map. Having the angle between the two points is neat. One possible improvement would be to have a measure tool that returns distance (and angle) instead of reading off a ruler.

I have no idea what the units of measurement are. Pixels? Mm? Certainly not cm or inches, which is what I was looking for. I wouldn’t have even thought to rate this if it hadn’t left me with such confusion. Any sort of labels would’ve changed this to no review, or even a four star. But I’m just confused. Which is disappointing. At least you can upload images of your actually screen, which is more than I can say for the last app I tried. That’s keeping this from a one star.

First time you open this app, it remains on. No off switch. I'm not sure if the measurement is in pixels or whatever. I can't use this.