Bought 10 of these. Need 8 for my model railroad. tested all 10, and they were all very close readings. They are also close to my multimeter reading.
This unit also shows 0-1 amp accurately on the scale.
And they are plug and play.
These came with the necessary nuts and washers.
Took a while to get here but worth it.
Good value for the money.
I purchased several of these ammeters to use on the transformer outputs of my model railroad layout. These ammeters are perfect for such an application. The accuracy is good and the cost for each is perfect for hobby applications. Also, I would not hesitate to use the meters in higher voltage applications.