Check Indicators, Runout & Machine Setup With Greater Confidence

A moving pointer can reveal a machining problem, but how do you know the indicator itself is responding correctly? Starrett testers cover precision equipment for comparative checking plus indicator verification across machine shops, toolrooms, inspection departments & maintenance workshops. From Starrett dial test indicators used for runout, alignment & setup through to dedicated indicator testers designed to check linearity plus repeatability, this collection supports the measurement chain from detecting movement to verifying the instrument detecting it.

For comparative measurement across a wider range of applications, explore Starrett | Indicators & Gauges. For setup tools used around machine inspection plus alignment, Starrett | Machinists Tools provides the second closely related Starrett range.

What Type Of Starrett Tester Do You Need?

“Tester” can describe two related but distinctly different tools.

The distinction is important:

Test indicator → checks the work or setup.

Indicator tester → checks the indicator.

Starrett Dial Test Indicators – Comparative Measurement Where Access Matters

A dial test indicator measures movement through a pivoting contact arm.

Unlike a conventional plunger indicator, its probe swings through an arc around a hinge point. That compact lever action makes test indicators particularly useful where a straight plunger cannot conveniently reach the measurement surface.

Typical applications include:

► Shaft runout
► Chuck centring
► Machine-vise alignment
► Fixture setup
► Bore checking
► Comparative inspection
► Surface comparison
► Machine-tool adjustment
► Restricted-access measurement

The tester does not diagnose the mechanical fault by itself.

It reveals variation. The machinist or inspector then interprets what that movement means within the setup.

Starrett 708 & 709 Dial Test Indicators

The Starrett 708, 708M, 709 & 709M families use a compact dovetail-mount design intended for precision comparative measurement.

Starrett specifies features including:

► 35 mm / 1-3/8" dial diameter
► Angled head for easier viewing
► Three dovetail mounting positions
► Jeweled movement
► Replaceable contact points
► Reversible contact action
► Satin chrome finish
► Inch plus metric configurations

Selected models provide different graduation plus range combinations, so choosing solely by the 708 or 709 family name is not enough.

For example, selected 708 configurations are available with very fine 0.0001" graduations.

Before ordering, check:

graduation → range → contact point → mounting requirement → accessories

That combination matters more than simply choosing the finest scale.

Starrett Last Word Test Indicators

The Starrett 711 Last Word is a long-established test-indicator family designed for machining, layout plus inspection work.

Its compact format plus available attachments make it useful where larger indicator bodies can become difficult to position.

Starrett identifies features including:

► Smooth jeweled lever action
► Positive reversing switch
► Swivelling tubular body
► Interchangeable contact points
► Easy-reading dial arrangement
► Multiple attachment options

One distinctive feature is the partially shaded dial, which can help the operator maintain reading orientation when the indicator is viewed through a mirror in applications such as jig-bore work.

Buyers researching this family may encounter searches such as:

► Starrett Last Word indicator
► Starrett 711 test indicator
► Starrett 711 dial tester
► Starrett lever indicator
► Starrett Last Word replacement contact
► Starrett test indicator accessories

Check the current model reference rather than relying only on an older catalogue number because individual Last Word configurations can change or be superseded.

What About Starrett 811 Test Indicators?

Not every restricted setup presents the dial at a convenient viewing angle.

The Starrett 811 & 811M families address that problem with a swivel-head design.

Starrett allows the head to be positioned from horizontal through vertical plus intermediate angles up to 90°, helping the operator place the dial where it can be read more naturally.

This can be useful around:

► Machine interiors
► Fixture-heavy setups
► Inspection stands
► Restricted sight lines
► Horizontal or vertical measurement arrangements

The ability to reposition the head does not remove the need for rigid mounting.

Visibility plus stability both matter.

Test Indicator Vs Plunger Dial Indicator

These instruments often work in the same workshop, but they are not interchangeable for every measurement.

A lever-style tester is particularly useful when access plus comparative movement are the main concerns.

A plunger indicator is often more appropriate where the measurement needs greater straight-line travel.

Checking Shaft Runout

A shaft can appear perfectly straight while still producing measurable variation during rotation.

A test indicator makes that movement visible.

A basic checking sequence is:

► Support or locate the shaft correctly
► Secure the indicator mount
► Bring the contact onto the required surface
► Establish appropriate contact engagement
► Rotate the component carefully
► Observe the complete change in indication
► Repeat the check to confirm consistency

The indicated variation does not automatically identify the cause.

Runout can relate to the component, bearings, mounting, chucking, contamination, reference surface or another part of the setup.

For broader workshop inspection equipment used around these checks, Testing & Measurement Tools provides complementary options.

Centring Work In A Chuck

Clamping a component securely does not guarantee that its working surface runs concentrically with the machine axis.

A test indicator helps expose that difference.

The process can be approached as:

mount → contact → rotate → observe → adjust → repeat

Small adjustments are made while the work is repeatedly checked until the required condition is achieved.

One important distinction:

Setting the dial to zero does not remove runout.

Zero only creates a convenient reference. The useful information is the amount the reading changes through the rotation.

Aligning A Machine Vise

A vise can look square on the table yet still be measurably misaligned across its working length.

A test indicator provides a more controlled way to check it.

Position the contact against a suitable vise reference face then traverse the machine along the relevant axis.

If the reading changes, the relationship between the reference face plus machine travel has changed.

Adjust the vise then repeat the sweep.

For the workholding side of machine setup, Clamps & Vises provides a closely related workshop pathway.

Contact Angle Can Change The Reading

Lever-style indicators introduce an important consideration: contact geometry.

The probe moves through an arc.

If the contact angle is significantly different from the intended measuring position, the indicated movement can differ from the actual displacement being investigated.

This is commonly described as cosine error.

The practical lesson is simple:

► Position the contact deliberately
► Follow the instrument's recommended geometry
► Avoid treating probe angle as irrelevant
► Be especially careful during fine comparative work

A finer graduation does not compensate for poor setup geometry.

Don't Buy More Resolution Than The Job Can Use

Starrett's own indicator-selection guidance makes an important point: choose the accuracy plus readout the job actually requires.

A 0.0001" graduation can be valuable for fine comparative work.

It can also be unnecessary if the process only requires 0.001" resolution.

Higher sensitivity places more demand on:

► Mounting rigidity
► Reference cleanliness
► Operator technique
► Machine stability
► Contact geometry
► Vibration control
► Repeatability

Choose resolution around the tolerance plus process rather than assuming the smallest graduation automatically produces the best measurement.

A Tester Needs A Rigid Mount

The indicator cannot distinguish between the component moving plus its own holder moving.

That makes mounting rigidity fundamental.

Before taking a reading:

► Secure the base
► Keep unnecessary extensions short
► Tighten mounting joints
► Check dovetail or stem engagement
► Position the dial where it can be read safely
► Keep the assembly clear of machine movement
► Confirm the setup repeats before making adjustments

A sensitive tester on a flexible mounting arrangement can simply provide a detailed display of mounting movement.

For positioning plus reference equipment used around machine setups, Measuring & Layout Tools supports the surrounding workflow.

Starrett Indicator Testers – When The Indicator Becomes The Workpiece

There is another side to this collection that deserves its own distinction.

A Starrett indicator tester is designed to check the performance of dial test indicators plus AGD indicators.

Instead of using an indicator to inspect a machine component, the tester applies controlled displacement so the indicator's response can be assessed.

Starrett's indicator tester provides direct-reading capability to 0.0001" or 0.002 mm for rapid checking of indicator linearity plus repeatability through ranges up to 1" or 25 mm.

That makes the measurement relationship:

indicator tester → controlled displacement → indicator reading → comparison

This is fundamentally different from using a 708 or Last Word tester on a shaft.

What Can A Starrett Indicator Tester Check?

The equipment is intended to help assess two particularly important characteristics.

Linearity

Does the indicator track controlled displacement correctly throughout the range being checked?

Repeatability

When the same condition is presented again, does the indicator return to a consistent reading?

Starrett's tester accommodates different indicator mounting arrangements, including compatible dovetail indicators, AGD indicators with 3/8" / 9.5 mm stems plus indicators using suitable 3/16" / 4.7 mm holder shanks.

The unit also incorporates fine adjustment for zero setting.

Why The Tester Can Be Repositioned?

Calibration work should not require the operator to struggle with an awkward viewing position.

Starrett's indicator tester can be swung between vertical plus horizontal positions by releasing the main hand knob securing the gauge assembly.

The micrometer head can also be rotated on its axis so the scale can be positioned for convenient reading.

These features support a practical objective:

keep the measurement controlled while making the scale readable.

For fine inspection work, ergonomics matter because awkward viewing can introduce unnecessary reading difficulty.

Indicator Verification Vs Formal Calibration

A workshop check plus a formal calibration program are not automatically the same thing.

An indicator tester provides controlled equipment for checking indicator behaviour, but organisations working under formal quality systems may also have defined procedures covering:

► Calibration intervals
► Traceability
► Environmental conditions
► Reference standards
► Measurement uncertainty
► Documentation
► Acceptance criteria

Follow the requirements of the workshop's quality system plus applicable procedures rather than assuming possession of an indicator tester alone satisfies every calibration obligation.

Tester Vs Micrometer – Different Measurement Jobs

A test indicator is designed primarily for comparison.

A micrometer is designed to determine a dimensional size within its specified measuring range.

For example:

Test indicator → Is this shaft running concentrically?

Micrometer → What is the shaft diameter?

Those questions are related but not interchangeable.

For direct dimensional measurement after setup or comparative inspection, Starrett | Micrometers provides the third direct Starrett collection supporting this measurement workflow.

Before Trusting The Reading

A moving pointer is evidence of movement somewhere in the measurement chain.

Before deciding the component is responsible, ask:

Is the mounting rigid?
Loose holders can produce apparent variation.

Is the contact clean?
Contamination can affect movement.

Is the reference clean?
A chip beneath the component changes the setup.

Is the probe angle appropriate?
Lever geometry influences fine comparative measurement.

Is there sufficient preload?
The contact needs usable travel in the required direction.

Does the reading repeat?
A result that changes unpredictably needs further investigation.

Is the instrument suitable for the required resolution?
The tester should match the tolerance being investigated.

Visibility Matters During Fine Inspection

A readable dial makes interpretation easier, especially when the indicator is positioned inside a machine or behind a fixture.

Good setup should consider:

► Dial orientation
► Available light
► Operator sight line
► Machine clearance
► Reflection or glare
► Safe viewing position

Inspection Mirrors & Lighting can support checks where the contact point or dial is difficult to view directly.

The operator should never need to lean into an unsafe machine area simply to read an indicator.

Protect Test Indicators Between Jobs

Test indicators combine a sensitive mechanism with a relatively small contact point.

Storage should protect:

► Contact tips
► Dial face
► Bezel
► Mounting surfaces
► Dovetails
► Stems
► Small accessories
► Indicator attachments

Loose storage beside punches, files plus cutting tools is unnecessary risk.

Tools Storage & Organization provides a practical pathway for separating sensitive inspection equipment from general workshop tools.

For workshops preparing equipment before workloads increase, Spring Jobsite Prep Getting Your Gear Ready covers practical checks that can prevent small equipment issues becoming job delays.

Good Measurement Starts Before The Pointer Moves

Fine instruments reward disciplined setup.

Clean references, rigid mounting, sensible resolution plus repeatable technique matter just as much as the name on the dial.

A tool is not just a tool. It’s a promise. looks at the wider relationship between dependable equipment plus professional work.

For tradespeople developing those habits early, The Apprentice's First Tool Kit: What You Actually Need provides a practical perspective on selecting tools around the work they actually need to perform.