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Features:

· Wide Variety of Jaw Sizes and Ranges

· Rugged Construction

· No Breaking of Circuit or Insulation

· No Batteries Needed

· Instant Readings

· One Hand Operation

· Ranges Changed Quickly

· No Transformers or Shunts Needed

The Columbia AC/DC Clamp-On Tong Test Ammeters (now manufactured by Weschler Instruments) measure AC or DC current instantly and accurately simply by encircling the conductor with the jaws and closing them. A clear accurate reading instantly registers on the scale. Readings are taken without breaking the circuit or insulation and accurate readings are made even through insulated cables. Readings can be taken without shutdowns avoiding time, labor or production losses. Current measurements are made without the use of transformers, ammeters, shunts and millivoltmeters.