Indicators
Indicators
A plunger-style indicator can't check runout on a spinning part, and a lever-type indicator can't hold a straight-line depth reading. Fowler's indicators split into three types built for different jobs: dial (a mechanical needle, straight-line plunger travel), test (a small lever probe for runout, alignment, and tight spaces), and electronic (a screen, in tiers from economy to Swiss-made Bluetooth). The guide below sorts out which type and tier fit the job.
Type
On Sale
Travel
Price
Accuracy
Lifetime Warranty?
Metric?
Bluetooth?
Digital Display?
Waterproof Rating
Fowler 0-.500"/12.5mm Mark VI Electronic Indicator with Bluetooth Technology and Lifetime Warranty
$1,202.00 $1,142.00
Fowler 0-0.500"/12.5mm Mark VI Electronic Indicator with Analog Display and a Lifetime Warranty
$1,378.00
Fowler 0-1"/25mm Mark VI Electronic Indicator with Bluetooth Technology and a Lifetime Warranty
$1,162.00 $1,104.00
Fowler-Sylvac 0-.500"/12.5mm Mark VI Electronic Indicator with Lifetime Warranty
$1,050.00 $1,000.00
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How to choose
Choosing a type
Dial vs. test vs. electronic
Dial indicators read straight-line plunger travel on a mechanical dial, the standard tool for checking height, depth, and flatness on a stand or fixture. Test indicators use a small pivoting lever instead of a plunger, which reaches into tighter spaces and reads sideways motion, making them the choice for checking runout on a spinning part or aligning a vise. Electronic indicators do either job with a screen instead of a needle, in tiers from economy to premium Swiss-made.
Environment
IP ratings and Bluetooth follow the same logic as calipers and micrometers
IP54 handles dust and light splash. IP67 survives sustained coolant exposure, which is why it shows up on the premium electronic lines. Bluetooth only pays for itself if the reading needs to reach an SPC log automatically. Otherwise it's added cost without added value for a bench-side check.
Beyond the indicator itself
Mounting and accessories matter as much as the indicator
An indicator is only as useful as what holds it in position. Magnetic bases, contact points, depth base attachments, and chucks extend or adapt an indicator you already own, worth checking before assuming a job needs a different indicator entirely.
Common questions
A dial indicator has a plunger that travels in a straight line, good for height and depth checks on a fixture. A test indicator uses a small pivoting lever instead, which reaches into tighter spaces and reads sideways motion, the standard choice for checking runout on a rotating part.
If the job is a visual check against a tolerance, a mechanical dial or test indicator does the job at a lower cost. Electronic makes sense when the reading needs to be faster to read at a glance, or when the tier adds a specific feature like IP67 coolant resistance or Bluetooth data output.
Most Fowler magnetic bases mount indicators with a standard 3/8" stem, which covers dial and many electronic indicators. Test indicators often use a different stem size, so check the mounting spec on both pieces before assuming they'll pair.