Starrett 98-6 Machinists Level 6 in
- 6 inch length, 1.19 inch wide base
- Ground main vial plus cross test vial for two-direction leveling
- Adjustable vials, set with a knurled knob on the side
- Involute groove between bearing flats for seating on round work
- 0.6 kg cast iron body, precision-machined reference surface
- Without case, one year warranty on material and workmanship
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A compact cast iron level for setting up machines and checking shafts, with a cross vial that flags sideways tilt on round stock. The listing omits vial sensitivity, so confirm it before close tolerance work.
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ASIN: B0002CSBNYModel: 98-6Category: Construction Levels
Overview
Starrett builds this machinists' level around a cast iron base with a precision-machined reference surface and a grooved underside that seats on shafts. A ground main vial reads along the length while a cross test vial checks sideways tilt, and both can be set with a knurled side knob.
Two vials reading at right angles let a machinist level a bed or a shaft in both directions from one placement, which saves resetting on round work. Missing from the listing is the graduation value of the main vial, the figure most machinists compare first. It also ships bare, with no case to protect the brass vial tube in a toolbox.
Who it's for
Machine shop and tool room setups, where a short level must seat on round stock and flat ways, are the target. Carpenters and builders checking long spans will find it far too short.
Pros and cons
- Cross test vial reads both directions together
- Involute groove centers on round work
- Vials adjustable from a side knob
- Cast iron base with machined reference surface
- Vial sensitivity not listed
- Ships without a protective case
- Short length limits long span checks
Performance notes
Accuracy depends on how well the main vial is set against the machined base, and the side knob lets the user restore that setting after a knock. On shafts, the involute groove centers the level so the cross vial can confirm it is not canted sideways, which removes a common source of false readings. Clean, burr free surfaces matter, since any chip under the bearing flats lifts the base.
Specifications
| Brand | Starrett |
|---|---|
| Model | 98-6 |
Frequently asked questions
How do I adjust the vials on the Starrett 98-6 level?
Turn the knurled knob on the side of the level to bring the vial to a positive setting. The included instructions guide covers the procedure.
Can the Starrett 98-6 level round shafts?
Yes. The base has an involute groove between the bearing flats that seats and centers on round work, and the cross test vial shows if the level is canted sideways.
Does the Starrett 98-6 come with a case?
No. This is the without case version; the package holds the level and an instructions guide.