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Home  >>  Products  >>  Film Flaws  >>  M/1 & M1/AC Holiday Detector

M1/AC Holiday Detector

M1/AC Holiday Detector


The Tinker & Rasor Model M1/AC Holiday Detector is a highly sensitive electrical instrument, designed to locate holidays (pin holes, voids, etc.) in thin film coatings of relatively high electrical resistance when such films are brushed or sprayed to the surface of material of low electrical resistance. In these applications, such as painted metal surface, the M1/AC Detector will locate these points very accurately. This method of electrical inspection of thin film is considered a non-destructive test with an applied voltage of 67-1/2 volts D.C. to the coated surface.




The model M1/AC was designed to inspect thin film coatings from 1 to 10 mil using ordinary tap water. The cellulose sponge electrode, when dampened with water is moved over the coated surface. When the electrode passes a void or bare spot a small current flows and actuates an audible signal. Some operators have found that the M1/AC Detector is effective on films to 20 mils if a wetting agent is used with the water. Non-sudsing type wetting agents similar to those used in developing photographic film are recommended.

The detector operates from 110/120 volt 50/60 cycle a.c. line current and the electrical design of the M1/AC Detector utilizes a very sensitive relay which is activated by a voltage regulated, solid state power supply. When a current of approximately 750 microamperes flows through the system, the relay closes and activates a signal bell.

  • Regulated 67.5v output
  • Push button calibration check
  • 2 Resistance settings
  • (80K Ω Metallic sun straights)
  • (90K Ω for coatings on concrete)
  • Typical under 20mils
  • Non-Destructive
  • Mil-Spec Case

M1/AC Close Up M1/AC Sponge


Internal Sponge Electrode for M/1 Holiday Detector
Internal Sponge Electrodes are available.
(See list below)
Internal Sponge Connection Kit is required
for Internal Sponge Electrodes.



Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices

Instrument with AC power cord, 15’ Ground Cable, 18" wand with 6' cable, Sponge electrode 6" x 3.5" x 2" (Sponge shipped compressed), 4 oz. Bottle of "Water Wetter", and Instructions Included

HD-M1/AC M1/AC Holiday Detector $1,225.00
HD-049-014 Wetting agent 8oz bottle 18.00
HD-055-882 Sponge replacement, 6" x 3.5" x 2" 14.00
HD-055-361 Sponge replacement, 2" x 2" x 7" 12.00
HD-054-031 3” I.D. Pipe 96.00
HD-054-041 4” I.D. Pipe 92.00
HD-054-051 5” I.D. Pipe 112.00
HD-054-061 6” I.D. Pipe 131.00
HD-054-081 8” I.D. Pipe 143.00
HD-093-KIT/28 Internal Connector Kit with 28' cable (no roller) Required for 1-1/2" to 8" Internal Sponge Electrodes 241.00


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