In trading on Tuesday, shares of the Proshares UltraShort Consumer Goods ETF ( SZK) entered into oversold territory, changing hands as low as $45.0358 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 Consumer Goods, the RSI reading has hit 26.3 — by comparison, the RSI reading for the S&P 500 is currently 56.1. A bullish investor could look at SZK's 26.3 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), SZK's low point in its 52 week range is $45.0358 per share, with $78.72 as the 52 week high point — that compares with a last trade of $45.04. Proshares UltraShort Consumer Goods shares are currently trading down about 2.7% on the day.