Brother P-TOUCH PT-1700 - Manual (Page 33)

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A triangle indicator on the display appears whether Underline or Frame is set on.
Tape width Possible character sizes
3/4” (18 mm) 1, W2, H2, 4, 8,
1/2” (12 mm) 1, W2, H2, 4, 8
3/8” (9 mm) 1, W2, H2, 4, 8
1/4” (6 mm)
BIG
1, W2
Box 1
Box 2 Box 4
Box 3