If you were to pick a key and chart every note of that key on the instrument; you would see 5 obvious hand positions. 5 POSITION information for guitar(6, 7 string), bass(4,5,6,7,8 string and fretless), piano(keyboards), mandolin, banjo (tenor and 5 string), violin, ukulele, any lefty AND MORE !
78% of stringed instrument players only know part of 1 hand position.
83% of stringed instrument players claim to have 'some mastery' of their instrument.
These slide rules simply show every note on the neck for any key you choose in 5 easy hand positions. Easy to use. Pick a key, set the slide, and play from the 5 hand positions. Improvise ! (Only part of the slide rules showing >>)