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 |