Someone asked for a use-case - ie why would I want this app? Night photography: How still really is your camera for a long exposure shot? Take a measure, adjust as needed. This is a great app and fun. Would love see some stats that can viewed and saved for later comparison. The Roller Coaster Physics app is along the lines of this app, and now allows you to email a full run of the measurements for later loading into Excel or other app. Looking forward to a new version

Can the option to export to a PDF file be added?

If you have a lot of data the app will just crash- totally useless. We had an earthquake in Los Angeles about an hour ago, and I wanted to show off this app, but it only crashes when you try to look at a history file that recorded for only 13 hours. It won’t email or send to documents which does nothing. I tried accessing the data from my MacBook Pro using an iPhone backup program, and the app no longer will allow access to its folders. Wish I could see the data. If the developer wants to reach me feel free to email me. I like the display screen but too bad it didn’t perform when I needed it to.

I know there are only two other reviews that give high praise, but one must be from the developer. This seismometer only displays one axis at a time…. a bit useless if you a trying to record all 3 or even just two for that matter. The streaming feature SEEMS to work well…. except it only displays the Z axis even if you select the Y or X axis. It will ONLY stream the Z axis. Since earthquakes and other shaking rarely occur on a single axis, and most are rarely on the Z axis (up/down), this is completely useless. Allow displaying/recording of multiple axis, and allow the stream to display ANY other axis besides the Z axis, and it will be a GREAT app.