Features: I. Overview 1 using the 2014 version of the latest V1.11 software, using M328 chip,, more features, in addition to the basic functions, as well as extensions. 2 micro-controller uses 8MHz external crystal, the measurement accuracy is better.
I googled the patent number and found the following info. The figures on the patent sketches looks slightly different than the piece. Patent number: US 3497806
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