Lemme used to sell these for 1,000 Euros new. Don't know how many were sold.
The box appears to implement the standard algorithm from Terman to determine self-capacitance - there is a long thread on this, which thread includes scans of the relevant pages of Terman.
By all reports, they do work. The main advantage of the Lemme box is that it automates standard tests of resonant frequency et al.
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