In trading on Monday, shares of the iShares California AMT-Free Muni Bond ETF ( CMF) entered into oversold territory, changing hands as low as $115.7964 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 iShares California AMT-Free Muni Bond, the RSI reading has hit 27.7 — by comparison, the RSI reading for the S&P 500 is currently 56.1. A bullish investor could look at CMF's 27.7 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), CMF's low point in its 52 week range is $114.68 per share, with $139.35 as the 52 week high point — that compares with a last trade of $115.80. iShares California AMT-Free Muni Bond shares are currently trading off about 0.4% on the day.