Review on 📊 Eiechip LED Digital Voltmeter Ammeter: Mini DC Digital Multimeter 100V 10A, Blue Red LED Amp Dual Digital Display Volt Meter Gauge for Car Current Monitoring and Testing 0.28 inch display by David Finley

Use these to monitor the 1/64 V/A track autotrack slot, 1 for each track. Accuracy is acceptable but not exact which I wasn't expecting anyway as they serve their intended purpose. The problem is that they don't work properly when using track power supplies. Puzzling why after trying several standard power supplies, but no running in standby, constant blinking with constant power. They will only work with a power supply that has the manufacturer's interference coil or a separate battery pack. Tried adding coils around the wire but same problem. So far about 1 month has worked where the other 3 wire types failed miserably. Probably use them again as a spare.