Test tube rack is a device which commonly used in laboratory to keep test tube upright so that the equipment does not roll away, spill or become accidentally cracked.
| Diameter of the Hole | Holes |
| 13 mm | 90 Holes (15 x 6) |
| 16 mm | 60 Holes (12 x 5) |
| 20 mm | 40 Holes (10 x 4) |
| 25 mm | 24 Holes (8 x 3) |
| 30 mm | 21 Holes (7 x 3) |
Test tube rack is a device which commonly used in laboratory to keep test tube upright so that the equipment does not roll away, spill or become accidentally cracked.
| Diameter of the Hole | Holes |
| 13 mm | 90 Holes (15 x 6) |
| 16 mm | 60 Holes (12 x 5) |
| 20 mm | 40 Holes (10 x 4) |
| 25 mm | 24 Holes (8 x 3) |
| 30 mm | 21 Holes (7 x 3) |
| Holes | 90 Holes (15 x 6), 60 Holes (12 x 5), 40 Holes (10 x 4), 24 Holes (8 x 3), 21 Holes (7 x 3) |
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