Superb ... and surprisingly versatile
[Updated for v3.5, Sep-2020] The new ‘maintain position’ feature greatly improves usability. ... Many thanks for incorporating this. . . [Updated Review] ... It just got even better !! Thanks for a very useful update ... I expect to be using this a lot. . . [Original Review] At first; this appears to be a rather specialist 'niche' App, but I am also finding it very useful for measurement of images other than ECG traces. Excellent work ... Thank You !!