D12-1
左側紅色箭頭帶「+」，右側紅色箭頭帶「-」。用途：標示正負方向。
20 × 80 mm・方形
數量與價格
| 數量（小張） | 未稅單價 | 未稅小計 |
|---|---|---|
| 20 | $14 | $280 |
| 40 | $10.26 | $410 |
| 60 | $8.37 | $502 |
| 80 | $7.25 | $580 |
| 100 | $6.49 | $649 |
| 200 | $4.59 | $918 |
| 300 | $3.75 | $1,125 |
| 400 | $3.22 | $1,288 |
| 500 | $2.62 | $1,310 |
| 1,000 | $1.37 | $1,370 |
| 1,200 | $1.16 | $1,392 |
| 1,500 | $0.94 | $1,410 |
| 2,000 | $0.72 | $1,440 |