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Click on the yellow buttons that say "click here..." for the free version of the 100 min, minutely SBG (this graph is designed for consecutive timings as short as 1 second or as long as 100 minutes, and can record rates as high as 300 per minute. The trend period is 10 minutes, a x2 trend line is approximately 34 degrees).
Details
Available now for free! Click on the yellow buttons that say "click here..." for the free version of the 100 min, minutely SBG