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Compac Dial Test Indicator
inch reading
long range test indicator / multiple revolution test indicator

—Welcome Back Pricing—

Compac test indicators are back in stock

Made in Switzerland by TESA, the same manufacturer who makes the Interapid and Bestest indicators.
 

Crystals get scratched, discolor or crack for one reason or another, but here's good news: if you bought the Compac test indicator from us, we'll give you a free crystal replacement. You will receive a coupon good for one free crystal replacement with every new purchase. That's the small print. Here's the big print:

  • It's a Compac test indicator
  • You bought it from Long Island Indicator Service and have a coupon
  • We'll replace the crystal any time
  • For as long as you own the gage
  • At no cost except our published shipping and handling charge shown on the coupon


     

Horizontal style indicator

 

These Swiss made indicators are unique with their extended range. Ideally suited for long run-outs or centering where more leeway is needed. Stem attachments T4 (5/32") and T8 (8 mm) are included. Other sizes are available. The carbide contact point is .080"

Model 215A and 215GA (.0001") have just .004" travel per revolution. This means that the lines on the dial are spaced much further apart making it easier to read. No magnifying glass needed.

Model 215A (back) and 215GA (front). Each comes with two stem attachments. Notice the large spacing of the graduations on model 215GA making it very easy to read.

Graduations

Total range

Contact point length

Dial

Model no.

List Price

Stock

Welcome Back

.0005"

.060"

.72"

1.06"

214A

202.00

in stock

179.00

.0005"

.060"

.72"

1.58"

214GA

225.00

in stock

189.00

.0005"

.120"

1.44"

1.58"

213GLA

313.00

in stock

254.00

.0001"

.024"

.72"

1.06"

215A

254.00

in stock

207.00

.0001"

.024"

.72"

1.58"

215GA

272.00

in stock

218.00

Optional contact point .031" carbide ball (.72" long)

018660-11

19.50

Additional contact points are available on page 21

 

You may order online by selecting any linked model number. A schematic drawing is available showing indicator dimensions. For tolerances, see below.

 

Vertical style indicator

 

These rugged Swiss made indicators are unique with their extended range. Ideally suited for jig-bore work, for long run-outs or centering where more leeway is needed. Stem attachment T4 (5/32") is included. Any standard dovetail holders or attachments will fit. Centering holder SCP and SCPA are specifically designed to hold this indicator in its vertical position. The carbide contact point included is .080"

 

Model 224A on the left showing the removable stem attachment (T4).
Model 224GA on the right has a large, easy to read dial.

Graduations

Total range

Contact point length

Dial

Compac no.

Stock

Price 2014

.0005"

.060"

.72"

1.0"

224A

in stock

246.00

.0005"

.060"

.72"

1.6"

224GA

in stock

267.00

.0005"

.120"

1.44"

1.6"

223GLA

in stock

362.00

.0001"

.024"

.72"

1.0"

225A

sold out

.0001"

.024"

.72"

1.6"

225GA

in stock

325.00

Optional small contact point .031" carbide ball (.72" long)

018660-11

19.50

Additional contact points are available on page 21

 

You may order online by selecting any linked model number. A schematic drawing is available showing indicator dimensions. For tolerances, see below.

 

Parallel style indicator

 

Compac model 233GLA shown above, with two stem attachments and box. This parallel type has a short dovetail on the far end, and a long dovetail along the under side (not seen). Only limited quantities of this rare item are in stock. The manufacturer has discontinued these models.

Model no.

Graduations

Total range

Travel per revolution

Dial

Contact point length

Stock

Price 2014

234GA

.0005"

.060"

.020"

1.58"

.72"

in stock

264.00

233GLA

.0005"

.120"

.040"

1.58"

1.44"

in stock

343.00

 

You may order online by selecting any linked model number. A schematic drawing is available showing indicator dimensions.
Stem attachments T4 (5/32") and T8 (8 mm) included. For tolerances see below.

 

Free crystal replacement

 

Crystals get scratched, discolor or crack for one reason or another, but here's good news: if you bought the Compac test indicator from us, we'll give you a free crystal replacement. You will receive a coupon good for one free crystal replacement with every new purchase. That's the small print. Here's the big print:

  • It's a Compac test indicator
  • You bought it from Long Island Indicator Service and have a coupon
  • We'll replace the crystal any time
  • For as long as you own the gage
  • At no cost except our published shipping and handling charge

     

Compac spare parts

 

Compac spare parts lists are available on-line. We will gladly e-mail you any parts lists which are not available on-line.

Also available: carbide and ruby contact points in various sizes and stem attachments and indicator holders.

We are reticent to sell any product for which spare parts are not easily available. After all, we're in the repair business. Fortunately virtually every COMPAC spare part is always in stock and can be shipped immediately. Large orders may require 4-6 weeks. There are no minimum purchases required.

 

Compac black dial / yellow dial

 

Compac model 244BF and other black dial models have been discontinued. It had a black dial and orange hand like the more popular Bestest indicators. Travers Tool may still have a supply of these and is likely to offer them until stock is exhausted. Long Island Indicator has replacement dials and hands for some of these models, and because all other parts are identical to the standard white dial models these indicators will remain serviceable for years to come.

Yellow dials are the standard for metric gages in the USA. While most new metric Compac indicators are shipped with white dials, yellow dials can be purchased and installed.

 

The not-so-secret code

 

It doesn't take an Alan Turing to figure out the COMPAC model codes. Or does it?

  • G models have large dials
  • L models have long contact points
  • A models read in inches
  • E models are waterproof
  • B models have bezel locks
  • S models have single revolutions

     

Metric models

 

COMPAC gages are available in inch or metric versions. The letter A indicates inch readings. It comes from the French word anglais (English).The absence of the letter A indicates metric readings. While many parts are interchangeable, contact points and many gears are not. Check the parts lists carefully. Compac metric test indicators are shown on page 108.

 

fe / fges / fu / fw

 

The manufacturer's inspection reports may use these DIN (German Industry Standards) abbreviations. Here's what they mean, in short.

Deviation (fe): maximum error over the entire range of the indicator

example: maximum errors are minus .0002" and plus .0004",
therefore (fe)=.0006"

Total Deviation (fges) takes into account the retrace error (fu) added to the maximum error (fe)

example: (fe)=.0006" and (fu)=.00015", therefore (fges)=.00075"

Retrace error (fu): (hysteresis) the difference between readings up the scale and then back down the scale. If these points are drawn as a line on a graph then a retrace error will be evident.

Repeatability (fw): the inherent error in measurement of the same spot with repeated trials.

By international agreement, countries will honor each others' standards. Thus, the DIN standards are perfectly acceptable in place of NIST.

 

Important calibration information

 

Compac models are designed to permit a true reading when the angle between the stylus and the reference surface is 0 (i.e.., they are parallel).

Since the dial test indicator is used as a comparator, the angle can usually be set to remain at 0 for all comparisons. However, when the indicator is run through its range while attempting direct readings or for calibration, this angle will of necessity change, introducing the cosine error.

In the rare cases when measurement is required with the stylus at an angle other than 0 with respect to the reference surface the readings should be corrected. Refer to calibration instructions for details.

All new Compac test indicators come with a calibration certificate from the manufacturer, but they are not NIST traceable. If you need an NIST calibration certificate, please specify at time of ordering. We will provide these certificates for $21 additional (series 210, 220 and 230 indicators shown on this page only).

While Compac test indicators are accurate 1 graduation when used as a comparator, they have total allowable deviations over their entire range as follows:

 

Compac model

total
range

dial configuration

total
deviation

hysteresis

repeatability

measuring force

214A / 214GA

.060"

0-10-20

.0005"

.00015"

.00015"

0.35N

224A / 224GA

.060"

0-10-20

.0005"

.00015"

.00015"

0.35N

234A / 234GA

.060"

0-10-20

.0005"

.00015"

.00015"

0.35N

213LA / 213GLA

.120"

0-20-40

.001"

.00025"

.00015"

0.20N

223LA / 223GLA

.120"

0-20-40

.001"

.00025"

.00015"

0.20N

233LA / 233GLA

.120"

0-20-40

.001"

.00025"

.00015"

0.20N

215A / 215GA

.024"

0-20-40

.0005"

.0001"

.00005"

0.30N

225A / 225GA

.024"

0-20-40

.0005"

.0001"

.00005"

0.30N

235A / 235GA

.024"

0-20-40

.0005"

.0001"

.0001"

0.30N

 

Source: Tesa SA, July 2005

 

Repair Service

 

All spare parts are available and, with experience since 1959, repairs can effectively be made on any of these indicators.

Because we are an authorizer repair shop, we can also take care of any warranty issues which might arise. When making repairs, it's our policy to replace any damaged or worn parts necessary for the full function of the indicator. This way you'll be sure to get an indicator that's as good as new and one you can rely on. If you use a credit card, turn-around is less than one week. For details, including repair costs, see page 30.

Plus, if you request it, we'll provide you with a short-form certificate of calibration free with every indicator repair. After all, when your instrument comes back, you need to know that it's accurate.

 

Contact point length

 

It is imperative that the correct length of contact point be used with dial test indicators. Test indicators rely on leverage ratios to amplify the readings. Changing the length of the contact point will alter the ratio and result in incorrect readings. The common problem of incremental errors (i.e., the readings gradually get worse from one revolution to the next) is most likely due to the installation of the wrong length point.

Most manufacturers specify the proper point length in their catalogs. It is not always clear, however, how the over-all length of the point is measured.

Compac contact points should be measured from the center of the carbide ball to the far end of the threads.

Some end-users purposely install extra-long contact points because their application requires it. If the contact point is exactly twice the length, then the readings on the dial will be doubled. Most .0001" Compac indicators can be fitted with a long point which will make the graduations read .0002"

Most manufacturers make indicators designed for use with long contact points. Compac test indicators have the letter designation "L" as a component of their model numbers.

Contact points can have a variety of ball diameters typically ranging from .015" to .120" and are available in carbide or ruby (special order). It is highly recommended that contact points fitted with carbide balls be used, especially for .0001" indicators. The size of the ball diameter has no effect on the indicator's accuracy.

To find the ordering number for contact points refer to the contact points list on page 21.

 

SPI equivalents

 

For a period of years, the Compac indicators were sold by SPI using their own model numbers. Numbers such as 201533 may appear with or without hyphens: 20-153-3. SPI stopped carrying the Swiss indicators in favor of cheap Asian imports. Although you can no longer get these indicators under the SPI model numbers, you can buy the exact same indicator using the Compac model number. Here are some of the more popular SPI numbers and their conversion to Compac.

  • SPI 20-140-0 = Compac 214A
  • SPI 20-153-3 = Compac 223GLA
  • SPI 20-143-4 = Compac 213GLA
  • SPI 20-145-9 = Compac 215GA
  • SPI 20-155-8 = Compac 225GA

For more equivalent models see page 148.

 

A word about Compac

 

In the 1950-60's Compac of Geneva, Switzerland, manufactured the best selling indicator and dial bore gage imports in the United States. These models were sold with the name Alina. They were so well built and such favorites of machinists of the time that, even today, we receive these indicators for repair. In Europe the indicators were sold with the name Parvus. In a misguided effort to build a sturdier gage, the manufacturer changed the models to clinkers that had all the grace of a bread box. These were the short lived IXL series.

Just a few years later, they introduced the current Compac models. They have had minor changes in the past 10 years but nothing that affected the over-all look or performance. The Compac indicator is designed to last: sturdier than the Bestest and less costly than the Interapid. It fits perfectly in-between. They are also marketed in the UK with the name Mercer, and previously in the USA with the name SPI.

Tesa of Renens, Switzerland, is the manufacturer of Compac indicators as well as Bestest, Tesatast and Interapid indicators. Swiss made Compac test indicators are featured in the current Brown & Sharpe and Tesa catalogs.



 

Questions and Answers

 

Q: I am interested in the Compac 213GLA test indicator. Your website said that some have had dials that were not printed very well, though, but also that Compac was your indicator of choice for 4 decades. Are the dials back up to snuff?

A: The dial problem is sporadic and most often the dials are perfectly fine. You may need a magnifying glass to notice any defects. We tend to be overly critical in this respect, probably to our own detriment. (As of 2014, the dials seem to be in good shape.)

 

Q: What is the best way to preserve the dovetails in the long run on something like the Compac, with integral, non-hardened dovetails?

A: The body, and dovetails, is brass with a hard chrome finish. If you do not over tighten the dovetail attachments you will not cause any damage. Should the indicator be ripped from its holder, then the dovetail will probably have an unrepairable gouge. Fortunately, the indicator has 3 dovetails and you can always switch to using one of the others.

 

Q: I want a quality dial test indicator where the dial hand always moves clockwise whether the point is pressed from either direction and no "reversing lever" to worry about. I also prefer .0005" graduations, 1.5" dial, and .060" movement or close to it. I was under the impression the Compac worked in this manner, but I was just told they work just like my interapid.

A: Compac hands always go in just one direction (clock-wise) no matter how you deflect the contact point. There is no reversing lever to deal with.

 

 

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Long Island Indicator Service Inc
14 Sarah Drive — Hauppauge NY 11788 — USA
 


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This page's most recent revision: 9 APRIL 2014
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