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Compac
High Quality Metric Dial Test Indicator made in Switzerland

 

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 klunkers that had all the grace of a tin 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 with more options than the Interapid. It fits perfectly in-between. They are also marketed with the name Mercer, and formerly in the USA with the name SPI.

Tesa of Renens, Switzerland, is the current manufacturer of Compac indicators as well as Bestest, Tesatast and Interapid indicators.

If there is one thing that sets these apart from the rest, it is the sturdy construction. The oversized ball bearings will not be damaged, the case will not be dented or crack, the gear teeth will not bend, the bezel will remain round under conditions that would cause the Bestest indicator to malfunction. That is not to say that you could never damage this Compac indicator but the fact remains that the only real cause of trouble is dirt in the form of oil and grease. You will be able to break the contact point and you can also ruin the plastic crystal if you are not careful.

For a limited time: you will receive 20% off list price on many Compac Test Indicator ordered online.
(Valid for shipment to a US or APO address only. Sorry, no international orders.)

Horizontal Short Range - Single Revolution

 

Compac 0.002 mm Model 245G (front) and Model 245 (back) with two stem attachments.

  • The standard contact point has 2 mm Ø carbide ball.
  • Two stem attachments T4 (4 mm) and T8 (8 mm) are included.
  • For tolerances see bottom of this page.

Note that these metric indicators are not always in stock. You may have to allow 4-6 weeks for shipment on this promotional sale.

Graduations

Total range

Compac number

Dial Ø

Contact point length

2017 price USD

with 20% Discount

Internet Order

0.01 mm

0.8 mm

242

27 mm

18 mm

242.00

193.60

order now

0.01

0.8

242G

40

18 mm

256.00

204.80

order now

0.01

0.5

243GL

40

45 mm

261.00

208.80

order now

0.01

0.5

243L

27

45 mm

246.00

196.80

order now

0.002

0.2

245

27

18 mm

260.00

208.00

order now

0.002

0.2

245G

40

18 mm

276.00

220.80

order now

Small diameter carbide contact points (optional)

Contact point length

Click to order

Extra small carbide contact point Ø 0.8 mm diameter (select appropriate length). Will fit any indicator on this page.

18 mm

MTC26-09

21.50

36 mm

MTC26-16

21.50

45 mm

MTC27-02

21.50

Horizontal Long Range - Multiple Revolutions

 

These Swiss made indicators are unique with their extended range. Ideally suited for long run-outs or centering where more leeway is needed.

Compac model 215GL with 0.002 mm graduations and 2 stem attachments

  • Stem attachments T4 (4 mm) and T8 (8 mm) are included. Other sizes and styles are available.
  • The carbide contact point is 2 mm diameter. Other sizes and styles (ruby, etc.) are available.
  • For tolerances, see bottom of page.

Graduations

Total range

Model no.

Dial diameter

Contact point length

2017 price USD

with 20% Discount

Internet Order

0,01mm

1,5mm

213

27mm

18mm

265.00

212.00

order now

0,01mm

1,5mm

213G

40mm

18mm

273.00

218.40

order now

0,01mm

3,0mm

212L

27mm

36mm

310.00

248.00

order now

0,01mm

3,0mm

212GL

40mm

36mm

317.00

253.60

order now

0,002mm

0,6mm

215

27mm

18mm

279.00

223.20

order now

0,002mm

0,6mm

215G

40mm

18mm

292.00

233.60

order now

0,002mm

1,2mm

215GL

40mm

36mm

348.00

278.40

order now

0,001mm

0,6mm

216G

40mm

18mm

317.00

253.60

order now

Vertical Long Range - Multiple Revolutions

 

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.

Compac model 223 (left) and model 222GL with long point (right) and one stem attachment.

  • Stem attachment T4 (4 mm) 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. Other sizes and styles are available.
  • The carbide contact point included is 2 mm in diameter. Other sizes and styles (ruby, etc.) are available.
  • For tolerances, see bottom of page.
  • Note that these models are not always in stock and 4 to 6 week delivery is likely.

Graduations

Total range

Model no.

Dial diameter

Contact point length

2017 price USD

with 20% Discount

Internet Order

0,01mm

1,5mm

223

27mm

18mm

296.00

236.80

order now

0,01mm

1,5mm

223G

40mm

18mm

312.00

249.60

order now

0,01mm

3,0mm

222L

27mm

36mm

374.00

299.20

order now

0,01mm

3,0mm

222GL

40mm

36mm

381.00

304.80

order now

0,002mm

0,6mm

225

27mm

18mm

342.00

273.60

order now

0,002mm

0,6mm

225G

40mm

18mm

361.00

288.80

order now

Parallel Long Range - Multiple Revolutions

 

Compac model 232L 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). These parallel models are rarely in stock and require up to 4 weeks for delivery. The inch versions of these parallel style indicators have been discontinued.

  • Stem attachments T4 (4 mm) and T8 (8 mm) are included. Other sizes and styles are available.
  • The carbide contact point is 2 mm diameter. Other sizes and styles (ruby, etc.) are available.
  • For tolerances, see bottom of page.

Graduations

Total range

Model no.

Dial diameter

Contact point length

2017 price USD

no discount (*)

Internet order

0,01mm

1,5mm

233G

40mm

18mm

342.00

342.00

order now

0,01mm

3,0mm

232L

27mm

36mm

422.00

422.00

order now

0,01mm

3,0mm

232GL

40mm

36mm

437.00

437.00

order now

0,002mm

0,6mm

235G

40mm

18mm

392.00

392.00

order now

(*) Sale discounts do not apply to these parallel style indicators.

Important calibration information

 

Compac models are designed to permit a true reading when the angle between the stylus and the reference surface is 0° (ie., 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.

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

Model

total range

dial configuration

total deviation

hysteresis

repeatability

measuring force

213/213G

1.5 mm

0-25-50

.013mm

.003mm

.003mm

0.35N

223/223G

1.5 mm

0-25-50

.013mm

.003mm

.003mm

0.35N

233/233G

1.5 mm

0-25-50

.013mm

.003mm

.003mm

0.35N

212L/212GL

3 mm

0-50-100

.026mm

.006mm

.003mm

0.20N

222L/222GL

3 mm

0-50-100

.026mm

.006mm

.003mm

0.20N

232L/232GL

3 mm

0-50-100

.026mm

.006mm

.003mm

0.20N

215/215G/216G

0.6 mm

0-5-10

.013mm

.0025mm

.0015mm

0.30N

225/225G

0.6 mm

0-5-10

.013mm

.0025mm

.0015mm

0.30N

235/235G

0.6 mm

0-5-10

.013mm

.0025mm

.0015mm

0.30N

242/242G

0.8 mm

0-40-0

.013mm

.003mm

.003mm

0.25N

243L/243GL

0.5 mm

0-25-0

.013mm

.0035mm

.003mm

0.10N

245/245G

0.2 mm

0-10-0

.004mm

.002mm

.0015mm

0.25N

 

Source: Tesa SA, July 2003

Compac Indicator Repair

 

Who would buy a Rolls Royce if repairs weren't possible? Not to worry, Compac spare parts are available, in stock, and with our experience since 1959, repairs can effectively be made on any of these Compac indicators. For details, please refer to page 30.

Additionally, we have now printed a Compac repair manual. See page 194.

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 (ie, 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 0,002 mm Compac indicators can be fitted with a long point which will make the graduations read 0,004 mm

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 1 mm to 3 mm and are available in carbide or ruby (special order). It is highly recommended that contact points fitted with carbide balls be used, especially for 0,002 mm 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 205.


Knipex Chain Nose Pliers with Cutter

Q&A

 

Q: I am interested in your metric Compac 213G dial test indicator. Would you please answer these questions about it? Is the crystal (glass) made of mineral glass or plastic? Is the bezel made of metal or plastic? What country are parts made in and where did the final assembly take place?

  • The crystal is made of plastic although what type of plastic is apparently "proprietary information" according to the manufacturer. The bezel is metal. The parts are made in Switzerland and the indicators are assembled in the factory in Renens, Switzerland.

For answers to this and many other questions, please refer to our new publications shown below.

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This page's most recent revision: 3 DECEMBER 2017
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Original photographs and content copyright 2017 by JWGrum

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