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Jastool professional digital Circuit 3-48V Tester Designed for car electrical circuits,automotive battery, battery charging systems,ignition systems,which is a must have tool for any automotive engineer ,electronic engineer or circuits DIY . 3-48v widely use for circuits test. .1 Accuracy voltage reading on white Backlit digital display. .Made with sharp stainless steel probe for piercing wires, for hard to reach areas. .Portable 140 In m long enough PU spring wire for easy operation .Constructed with acetate fiber, high toughness and shatter-proof. Please Note This is a negative mode one-way current circuit tester,when do measuring please attach the clamp to the grounding or negative pole.