Characters used on labels should be sized to take into account viewing distances and illumination conditions.
Additional Information: Table 12.5 gives character heights required for various viewing distances. Under less-than-optimal viewing conditions, the preferred values should be used as minima. The preferred values should also be used for critical markings associated with safety-related systems.6146
Table 12.5 Minimum And Preferred Character Heights For Various Viewing Distances
Viewing Distance |
Minimum Character Height |
Preferred Character Height |
||
feet (m) |
inches (mm)1 |
points2 |
inches (mm)3 |
points2 |
2.33 (0.71) |
0.11 (2.84) |
8 |
0.17 (4.27) |
12 |
3 (0.91) |
0.14 (3.56) |
10 |
0.22 (5.49) |
16 |
4 (1.22) |
0.19 (4.88) |
14 |
0.29 (7.32) |
21 |
5 (1.52) |
0.24 (6.10) |
17 |
0.36 (9.14) |
26 |
6 (1.83) |
0.29 (7.32) |
21 |
0.43 (10.97) |
30 |
10 (3.05) |
0.48 (12.19) |
35 |
0.72 (18.29) |
50 |
20 (6.10) |
0.96 (24.38) |
70 |
1.44 (36.58) |
100 |
30 (9.14) |
1.44 (36.58) |
100 |
2.16 (54.86) |
150 |
40 (12.19) |
1.92 (48.77) |
140 |
2.88 (73.15) |
200 |