... This is a really great calculator while it works. They are an extremely handy if you have to make conversions from English to metric or vice versa. As a field scientist, I need a durable calculator and have purchased five of these for my self and my staff with mixed success. Two have lasted over a year, although one of them stopped working after about two and a half years of use. The other three did not last a year. For some reason the display begins to fail with all of the calculators I have had problems. I'm currently looking for something very similar to this calculator that will last longer. Although they are very handy, their unreliability makes them a poor investment. ...
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