Casio SP-100USNU User Manual page 12

k Dose (Des)
Example: "Ordered dose amount" = 150 mg, "Quantity" = 1 mL,
"Amount on hand" = 50 mg
r
1 A
2 =
3 150=
4 1=
5 50=
6 =
Ordered dose 
"Ordered dose  Desired dose" (scroll)
If something else is displayed, press r again.
Ordered dose amount? mg
Quantity?
Amount on hand?
Desired dose amount
12
Enter [ = ]
mL
mg
mL
3.00