Voltcraft ms 430 multi tester voltcraft ms 430 p the voltcraft ms 430 has been designed for contact free detection of alternating current ac voltages it measures stationary electrostatic fields that are generated by ac voltage via the insulation if ac voltage is present this is displayed visually by a red led and acoustically by an audio signal additionally the product has an integrated led torch for illuminating dark corners the product is operated with 2x aaa batteries p voltcraf