HP 50g Graphing Calculator - Manual (Page 157)

Page 3-27
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:
Units manipulation tools
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.