NEW YORK (TheStreet) -- Investors seeking the safety of the U.S. Treasury market should consider the 20+ Year Treasury Bond ETF (TLT) - Get iShares 20+ Year Treasury Bond ETF Report.

Exchange-traded funds are a basket of U.S. Treasury bonds with maturities of 20 to 30 years, which trades like a stock.

Investors looking to buy gold should consider the SPDR Gold Shares ETF (GLD) - Get SPDR Gold Trust Report, which is backed by gold bullion and matches the performance of Comex Gold futures contracts.

Investors looking to trade crude oil like a stock should consider the iShares GSCI Commodity-Index Trust Fund (GSG) - Get iShares S&P GSCI Commodity Indexed Trust Report. This commodity ETF is 70% to 75% weighted to energy and crude oil.

Investors looking to buy the greenback should trade the Deutsche Bank USD Index (UUP) - Get Invesco DB US Dollar Index Bullish Fund Report, which represents the U.S. dollar vs. a basket of currencies: the euro, Japanese yen, the British pound, the Canadian dollar, the Swedish krona and the Swiss franc.

Here is the daily chart for the bond ETF:


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The 20+ Year Treasury Bond ETF had a close of $129.70 on Tuesday, with the ETF closing just above its 50-day simple moving average of $129.11 and well above its 200-day SMA of $122.88 This ETF set its 2015 intraday high of $138.50 on Jan. 30 then traded as low as $122.97 on March 6.

Investors looking to buy the bond ETF should place a good 'til canceled limit order to purchase the ETF if it drops to $114.44, which is a key level on technical charts until of June.

Investors looking to reduce holdings should place a good 'til canceled limit order to sell the ETF if it rises to $132.13, which is a key level on technical charts until the end of the year.

Here is the daily chart for the gold ETF:


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The SPDR Gold Shares ETF had a close of $114.65 on Tuesday with the ETF just below its 50-day SMA of $114.74 and well below its 200-day SMA of $118.22.

This ETF set its 2015 intraday high of $125.58 on Jan. 22 then traded as low as $109.77 on March 17. This low was above the prior low of 109.67 set on Nov. 5 and is what technicians call a potential "double bottom."

Investors looking to buy the gold ETF should place a good 'til canceled limit order to purchase the ETF if it drops to $108.91, which is a key level on technical charts until of April.

Investors looking to reduce holdings should place a 'good til canceled limit order to sell the ETF if it rises to $136.11, which is a key level on technical charts until the end of the June.

Here is the daily chart for the commodity ETF:


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The iShares GSCI Commodity-Index Trust Fund had a close of $20.70 on Tuesday, with the ETF closing above its 50-day SMA of $20.29 and well below its 200-day SMA of $25.44.

This ETF shows a potential double bottom, with lows of $18.81 on Jan. 29 and $18.83 on March 18, which was a "key reversal" day. This is a bottoming pattern.

Investors looking to buy the commodity ETF should place a good 'til canceled limit order to purchase the ETF if it drops to $19.68, which is a key level on technical charts until the end of the week.

Investors looking to reduce holdings should place a good 'til canceled limit order to sell the ETF if it rises to $24.02, which is a key level on technical charts until the end of the year.

Key levels on technical charts of $21.67 and $23.20 will be around until the end of June.

Here is the daily chart for the dollar index:


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The PowerShares DB US Dollar Index Bullish ETF had a close of $25.81 on Tuesday, with the ETF closing above its 50-day and 200-day SMAs of $25.61 and $23.62, respectively, after the dollar traded as high as $26.50 on March 13.

Investors looking to buy the dollar ETF should place a good 'til canceled limit order to purchase the ETF if it drops to $24.10, which is a key level on technical charts until the end of June.

Investors looking to reduce holdings should place a good 'til canceled limit order to sell the ETF if it rises to $46.20, which is a key level on technical charts until the end of the year.

Investors not familiar with technical analysis should begin with the notion that a price chart for an index or stock shows a road map of past price performance, which provides guidance for predicting future share price direction.

Here is how to read a daily chart: There are two moving averages to follow; the 50-day simple moving average is in blue while the 200-day SMA is in green.

Here is how to read a weekly chart: This chart shows weekly price bars going back to the beginning of 2007 and thus includes the crash of 2008, then the current bull market for stocks that began in March 2009.

The red line tracks the ups and downs of the key weekly moving average. The green line is the 200-week SMA.

The red line that oscillates along the bottom of the chart is the momentum reading on a scale of 0 to 100. A reading below 20 is oversold and a reading above 80 is overbought.

A technically positive weekly chart occurs when a stock ends a week above its key weekly moving average with the momentum reading rising above 20.

A technically negative weekly chart occurs when a stock ends a week below its key weekly moving average with the momentum reading declining below 80.

This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.