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質問 Difference between "external contact type" of "internal contact type"?
Are there any precautions when buying?
答え Big difference, If the measurement object is made of metal and non-ferrous metals "external contact type", It becomes "internal contact type" in the case of non-metal, such as wood and plastic.
This means that measuring instrument that can be used in measured is whether or not some of the electrical conductivity is different.
外部接点方式ポイントファインダーの基本原理External contact type
 
Merit:   Can be measured with high precision at low
       cost.
Demerit:It not be measured rusty metal or plastic
       wood.
       Need the magnet cable the ceramic spindle.

[Basic principle of external contact type point finder]
Machine are made of metal.
Metal can be made to flow current.
Weak current flows to the work It install a point finder to the main shaft, (-) will be charged. Mandrel so we charged (+), LED will light this touches the work.

[Point finder (PTN, PTC, WP type), centering gauge Swing type (NM type)]
Is, it becomes the place where this has left radius of the stylus from work.
You can measure and centering with an accuracy of 1 / 1000mm If radius of correction.

[Tool Setter (M-50, S-50, S-100 type)]
The cutting edge is coming in at a distance of 100mm or 50mm than work.
If you press the start button here, the tool length is offset input tool setter.

 セラミックベアリング仕様のMCにはマグネットケーブルが必要です

It should be noted that if ALC, such as DLC also can not be measured by an external contact method is coating of the end mill.
If you are not sure whether internal or external contact at the time of purchase, please confirm to us once.
おむすび型の誤差 Internal contact type

[Point finder]
Merit:   Such as non-metallic
       products wood, plastic,
       any material also can
       measure.
Demerit: Error of "rice ball type"
       comes out.
       Time lag due to the
       deflection of the
       stylus results.
       Expensive than
       external contact type.
内部接点方式ポイントファインダーの基本原理
[Basic principle of internal contact type point finder]
 
Internal contact type in three fulcrum structure, is a scheme that can be measured fulcrum is disengaged when the stylus touches the work. Time lag due to the deflection of the stylus will occur at that time.

[Tool Setter (i-50)]
Time lag and the error does not come out.
If you press the start button in processing the LED lights, tool length is entered in the offset.
製品リンク Products that are relevant to this question is as follows. It will jump to the corresponding page by clicking.
[Point Finder Series]  [Tool Setter Series]