FIG. 1 is a perspective view of a calibration apparatus showing our new design;
FIG. 2 is a perspective view viewed from another angle thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 9 is a partially enlarged view thereof, taken along line 9 of FIG. 1;
FIG. 10 is a partially enlarged view thereof, taken along line 10 of FIG. 1;
FIG. 11 is a partially enlarged view thereof, taken along line 11 of FIG. 1;
FIG. 12 is a partially enlarged view thereof, taken along line 12 of FIG. 2;
FIG. 13 is a partially enlarged view thereof, taken along line 13 of FIG. 2;
FIG. 14 is a partially enlarged view thereof, taken along line 14 of FIG. 2;
FIG. 15 is a partially enlarged view thereof, taken along line 15 of FIG. 3;
FIG. 16 is a partially enlarged view thereof, taken along line 16 of FIG. 3;
FIG. 17 is a partially enlarged view thereof, taken along line 17 of FIG. 3;
FIG. 18 is a partially enlarged view thereof, taken along line 18 of FIG. 4;
FIG. 19 is a partially enlarged view thereof, taken along line 19 of FIG. 4;
FIG. 20 is a partially enlarged view thereof, taken along line 20 of FIG. 4;
FIG. 21 is a partially enlarged view thereof, taken along line 21 of FIG. 5;
FIG. 22 is a partially enlarged view thereof, taken along line 22 of FIG. 6;
FIG. 23 is a partially enlarged view thereof, taken along line 23 of FIG. 7;
FIG. 24 is a partially enlarged view thereof, taken along line 24 of FIG. 8;
FIG. 25 is a partially enlarged view thereof, taken along line 25 of FIG. 1;
FIG. 26 is a partially enlarged view thereof, taken along line 26 of FIG. 2; and,
FIG. 27 is a partially enlarged view thereof, taken along line 27 of FIG. 2.
The broken lines in the drawings illustrate portions of the calibration apparatus which form no part of the claimed design.