Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › how to test the current draw on a logic probe? › Reply To: how to test the current draw on a logic probe? March 30, 2021 at 4:43 pm #989776 Richard KirshyParticipant Typically logic probes are used to test digital circuits like those using TTL or CMOS logic. Not designed to test current draw. You’ll be better off using a DVOM setup to read current or using a known valued test light.