In trading on Wednesday, shares of the Proshares UltraShort MSCI EAFE ETF ( EFU) entered into oversold territory, changing hands as low as $45.86 per share. We define oversold territory using the Relative Strength Index, or RSI, which is a technical analysis indicator used to measure momentum on a scale of zero to 100. A stock is considered to be oversold if the RSI reading falls below 30.In the case of Proshares UltraShort MSCI EAFE, the RSI reading has hit 26.7 — by comparison, the RSI reading for the S&P 500 is currently 68.9. A bullish investor could look at EFU's 26.7 reading as a sign that the recent heavy selling is in the process of exhausting itself, and begin to look for entry point opportunities on the buy side. Looking at a chart of one year performance (below), EFU's low point in its 52 week range is $45.86 per share, with $82.32 as the 52 week high point — that compares with a last trade of $46.04. Proshares UltraShort MSCI EAFE shares are currently trading down about 5% on the day.