HP-01 LED calculator watch operation and how to
In this section you will learn what the HP-01 LED watch can do and for example how to calculate the running costs of a telephone call in real time with the HP01. In former times, when a telephone call to overseas was much more expensive than nowadays, this was an important feature. Besides the HP-01 can calculate for example which day of the week is the 10th of October 2022 or which exact date is in 894 days in the future.
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