These levels have ground and graduated main vials
The base of the levels features an involute groove running the length of the base, which provides a reliable seat for round work
These vials are adjustable to a positive setting and are housed in a satin finished brass tube with a friction-fit closing cover to prevent breakage
| Level Type | 
Machinists | 
| Length (Inch) | 
4 | 
| Graduation Sensitivity Per 12 Inches | 
0.0050 in | 
| Base Flatness (Inch) | 
1/64 | 
| Overall Length | 
101.6 mm, 4 in | 
| Material | 
Cast Iron | 
| Number Of Horizontal Vials | 
2 | 
| Features | 
Ground & Graduated Main Vials | 
| Width (Inch) | 
7/8 | 
| Height (Inch) | 
1-3/16 | 
| Length | 
101.60 | 
| Catalog Number | 
98-4 | 
| Level Type | 
Machinists | 
| Length (Inch) | 
4-7/8 | 
| Graduation Sensitivity Per 12 Inches | 
0.0050 in | 
| Overall Length | 
152.4 mm, 6 in | 
| Material | 
Cast Iron | 
| Number Of Horizontal Vials | 
2 | 
| Features | 
Ground & Graduated Main Vials | 
| Width (Inch) | 
1-3/32 | 
| Catalog Number | 
98-6 | 
| Article Number | 
EAN / GTIN | 
Manufacturer Number | 
| U46004 98-4 | 
0049659504408 | 
50440 | 
| U46004 98-6 | 
0049659504415 | 
50441 |