In trading on Tuesday, shares of the Proshares UltraShort TIPS ETF ( TPS) entered into oversold territory, changing hands as low as $28.541 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 TIPS, the RSI reading has hit 29.6 — by comparison, the RSI reading for the S&P 500 is currently 71.3. A bullish investor could look at TPS's 29.6 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), TPS's low point in its 52 week range is $24.90 per share, with $31.38 as the 52 week high point — that compares with a last trade of $28.55. Proshares UltraShort TIPS shares are currently trading off about 1.2% on the day.