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There is no cheap and easy method. Simply reading resistance is not as simple as it sounds, most bio-electric devices are innaccurate to almost 10%. Sending and receiving currents is highly fragile in the human body as every mineral has an impact, water content varies per nano-second, and other Habits have cellular effects that could have varying lifetimes within the human systems (ie:smoking vs alcohol vs aspirin).
Best bet is to shell out a few bucks two or three times a year at the local university and have it done through a standardized and calibrated system.
Hope this answers/helps.