Digital vs Analog Dial Indicator: Which One Should You Buy?

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Digital vs analog dial indicator: the core difference

A digital indicator converts spindle movement into a number on a display. The Neoteck listing states a range from 0-1 inch (0-25.4mm) with a resolution up to 0.0005 inch (0.01 mm), switchable between mm and inch, with a zero setting function. The Clockwise listing states a 1.6 inch by 0.7 inch LCD screen, the same 0-1 inch (25.4mm) range and 0.0005 inch (0.01mm) resolution, with auto-off after 5-7 minutes that retains the zero position when turned on again.

An analog indicator moves a needle around a dial face. The Starrett listing states a 0-1.000 inch range with a .001 inch graduation and a 0-100 dial reading, with jewel bearings and a lug-on-center back. The Accusize listing states 0-1 inch measurement in 0.0005 inch increments, with a rotational bezel with clamp for setting a reference point without disturbing the zero position.

Range, resolution and accuracy

All four titles state a range topping out at 1 inch: the Neoteck and Clockwise listings state 0-1 inch (25.4mm), the Accusize title and bullets state 0-1 inch, and the Starrett listing states 0-1.000 inch. Resolution separates them: both digital listings state 0.0005 inch (0.01mm), the Accusize bullets state 0.0005 inch increments, and the Starrett listing states a .001 inch graduation.

Accuracy is stated on the digital listings and on the Starrett listing. The Neoteck spec table states a measurement accuracy of 0.0005 inch (0.01mm). The Clockwise listing states an accuracy of plus or minus 0.001 inch (0.03mm). The Starrett spec table states a measurement accuracy of plus or minus 0.001 inch. The Accusize spec table gives no accuracy figure, so accuracy for that listing is Not stated.

The Accusize listing contradicts itself on range and resolution. Its title and bullets state 0-1 inch in 0.0005 inch increments, while its spec table states a range of 0-0.05 inch and a resolution of 0.0001 inch, with an item number P900-S097 against the P900-S099 model and part number. Trust the title and bullets over the spec table, and confirm the range with the seller before buying.

Mounting, stems and magnetic bases

Two listings include a magnetic base, and two do not. The Neoteck set includes a magnetic base with two arms, a lower arm of 5 inch and an upper arm of 4.5 inch, a total height of 14.1 inch, a clamping hole diameter of 5/16 inch (8mm), and two solid magnet surfaces with on and off control and a maximum tensile force of 176lbs/80kg. The listing notes that force requires a metal working surface with a thickness of 30mm and above.

The Clockwise set includes a magnetic base with two magnetic faces and a maximum pull of 176 lbs, working best on 30mm+ thick metal or steel, with thinner metal surfaces reducing magnetic force. Its indicator comes with flat back and lug back options with a hole size of 6.5mm, a 3/8 inch stem diameter, and a UNF 4-48 threaded tip. The Neoteck base is stated as compatible with most dial and digital indicators.

The analog listings name mounts but no base. The Accusize indicator has a lug back with a 1/4 inch hole and states standardized dimensions for a secure fit with universal holders, magnetic bases and machining fixtures. The Starrett indicator has a lug-on-center back.

The gear: four indicators ranked

First, the Neoteck digital set. It pairs a 0-1 inch digital indicator with a magnetic base, a storage case, a rear cover, a manual and a battery, and the spec table states 2 LR44 batteries are required and included. Its resolution runs to 0.0005 inch (0.01mm), its base pulls up to 176lbs/80kg, and its warranty runs 18 months. One wrinkle: the spec table names one 1.5V battery in the box contents while also stating 2 LR44 batteries are required and included, so confirm the battery count with the seller. The set weighs 1900 g, and its indicator base is stated as compatible with most dial and digital indicators.

Second, the Starrett analog indicator. It states a 0-1.000 inch range, a .001 inch graduation, a 0-100 dial reading, jewel bearings, an unbreakable crystal, a hardened stainless steel stem, gears and pinions, a rack and spindle, and a massive bridge for rigid bearing support. It weighs 8 ounces and carries a 1 year warranty. One wrinkle: the spec table lists 1 AAA battery as required, which the bullets do not mention, and a mechanical dial indicator needs no battery to move its needle, so treat that entry as a listing error and confirm it with the seller. The listing states the indicator is made in the USA.

Third, the Clockwise digital set. It pairs a 0-1 inch digital indicator with a magnetic base, batteries, a user guide, a lug back and a certificate of calibration. Its resolution is 0.0005 inch (0.01mm), its accuracy is plus or minus 0.001 inch (0.03mm), and its LCD measures 1.6 inch by 0.7 inch. Its RS232 port transfers data to a PC, but the listing states the DTCR-01 cable is sold separately and is not USB compatible. It weighs 4 pounds, and no warranty term is stated.

Fourth, the Accusize analog indicator. Its title and bullets state 0-1 inch measurement in 0.0005 inch increments, a lug back with a 1/4 inch hole, a rotational bezel with clamp, a satin chrome finish, alloy steel construction and an interchangeable hardened contact point. It weighs 0.15 kg, and no magnetic base is included. Its spec table contradicts its title on range, resolution and item number, as noted above, and no warranty term is stated.

Which one fits your setup

Pick a digital listing when you want a number on a screen with inch and metric switching: both digital listings state 0.0005 inch resolution and a magnetic base in the box. Pick an analog listing when you want a needle on a dial: the Starrett listing adds jewel bearings and a 1 year warranty, while the Accusize listing adds a rotational bezel with clamp at 0.0005 inch increments. Check mounting before buying: the Neoteck clamping hole is 5/16 inch, the Clockwise lug back hole is 6.5mm, and the Accusize lug back hole is 1/4 inch. Confirm the range on the Accusize listing with the seller, since its table disagrees with its title.

FAQ: lasers and CNC

Do digital dial indicators need batteries?

The Neoteck listing states 2 LR44 batteries are required and included, while its box contents name one 1.5V battery, so confirm the count with the seller. The Clockwise listing names batteries in its included components but states no battery type or count. The analog listings need no battery to move a needle: the Accusize listing names none, and the Starrett spec table AAA entry, which its bullets do not mention, reads as a listing error, so confirm it with the seller.

What range do these indicators cover?

The digital listings state 0-1 inch, the Accusize title states 0-1 inch, and the Starrett listing states 0-1.000 inch. The Accusize spec table states 0-0.05 inch instead, so confirm that listing range with the seller before buying.

Can I use these indicators with my own magnetic base?

The Accusize listing states standardized dimensions for a fit with universal holders and magnetic bases. The Neoteck base is stated as compatible with most dial and digital indicators, and the Clockwise indicator comes with flat back and lug back options.

Why does the Accusize spec table disagree with its title?

The title and bullets state 0-1 inch in 0.0005 inch increments, while the spec table states a range of 0-0.05 inch and a resolution of 0.0001 inch, with an item number P900-S097 against the P900-S099 model. Trust the title and bullets over the spec table, and confirm the range with the seller before buying.

Does the Clockwise indicator connect to a computer?

It has an RS232 port for data transfer to a PC. The listing states the DTCR-01 cable is sold separately and is not USB compatible.

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