In trading on Tuesday, shares of the Proshares Short 7-10 Year Treasury ETF ( TBX) entered into oversold territory, changing hands as low as $32.90 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 Short 7-10 Year Treasury, the RSI reading has hit 28.1 — by comparison, the RSI reading for the S&P 500 is currently 71.3. A bullish investor could look at TBX's 28.1 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), TBX's low point in its 52 week range is $31.52 per share, with $34.65 as the 52 week high point — that compares with a last trade of $32.91. Proshares Short 7-10 Year Treasury shares are currently trading down about 0.6% on the day.