HP (Hewlett-Packard) 50g ユーザーズマニュアル

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Stack calculations in the RPN mode, do not require you to enclose the different 
terms in parentheses, e.g., 

 12_m ` 1.5_yd `  *

3250_mi ` 50_h ` /

These operations produce the following output:

Also, try the following operations:

5_m ` 3200_mm ` +

12_mm ` 1_cm^2  `* 2_s ` /

These last two operations produce the following output:

The UNITS menu contains a TOOLS sub-menu, which provides the following 
functions:

CONVERT(x,y): convert unit object x to units of object y 
UBASE(x):

convert unit object x to SI units

UVAL(x):

extract the value from unit object x

Note:  Units are not allowed in expressions entered in the equation writer.