A two-line display allows the users to check the equation and answer at the same time. Because the equation remains on display, it is easy to edit or make substitutions if necessary.
EL-510R
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EL-531RH, EL-509RH, EL-531R, EL-509R
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EL-531RH (BL/GR)
EL-520R
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EL-506R/EL-546R
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EL-500L
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EL-530L