It is lightweight, easy to use, easy to move, easy to distort, easy storage, can be hung flat, will not be affected by a long flat straightness, parallelism, not easy to rust.
HJ-88A with two bubbles.
| Spec | Qty(pcs) | Meas(cm) | G.W./N.W.(kg) |
| 12"/300 | 60 | 31×23x25 | 5/4 |
| 16"/400 | 60 | 41×23×25 | 5.5/4.5 |
| 20"/500 | 60 | 51×23×25 | 6.5/5.5 |
| 24"/600 | 60 | 61×23×25 | 7.5/6.5 |
| 32"/800 | 60 | 81×23×25 | 9/8 |
| 40"/1000 | 60 | 101×23×25 | 10.5/9.5 |