Subaru Robin RGX3600 - Manual (Page 20)

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(5) MEAGER TESTER
Used for measuring generator insulation resistance.
Select the one with testing voltage range of 500V.
(4) CIRCUIT TESTER
For measuring resistance, etc.
NOTE : The ordinary circuit tester may cause erroneous
readings due to their measuring method.
Use a high-grade, precise circuit tester to check
the generator components.
(6) TACHOMETER
Use the contactless type tacho meter for checking
engine speed.