HP 35s Scientific Calculator - Manual (Page 288)

A-2 Support, Batteries, and Service
A: Exponent of ten; that is, 2.51 × 10 –13 .
Q: The calculator has displayed the message  . What should I do?
A: You must clear a portion of memory before proceeding. (See appendix B.)
Q: Why does calculating the sine (or tangent) of π radians display a very small
number instead of 0?
A: π cannot be represented exactly with the 12–digit precision of the calculator.
Q: Why do I get incorrect answers when I use the trigonometric functions?
A: You must make sure the calculator is using the correct angular mode (
9
, , or  ).
Q: What does an annunciator in the display mean?
A: It indicates something about the status of the calculator. See "Annunciators" in
chapter 1.
Q: Numbers show up as fractions. How do I get decimal numbers?
A: Press   .
Environmental Limits
To maintain product reliability, observe the following temperature and humidity
limits:
Operating temperature: 0 to 45 °C (32 to 113 °F).
Storage temperature: –20 to 65 ° C (–4 to 149 °F).
Operating and storage humidity: 90% relative humidity at 40 ° C (104 ° F)
maximum.