Review on AD584KH 4-Channel Precision Voltage Reference Module with Case - 2.5V/7.5V/5V/10V by Justin Reedy

Arrived earlier than expected. Some of the sides are covered in some kind of ugly cardboard that says ACRYLIC. Once removed, the true beauty of this voltage standard is revealed. It has a USB port. I was expecting some kind of DC connection. However. Works, no instructions! Outrageous. I would appreciate at least a sheet of paper with some drawings on it. Yes, it's not needed, but I'm picky. If you read this page it says no battery included. found inside. Hooray! As soon as you connect the USB power supply, the yellow power LED lights up. You then turn on the switch and the reference voltage appears as one of the 4 red LEDs. There is a momentary switch that you press and the output voltage changes: 2.5V - 5.0V - 7.5V - 10V. I have the DC voltage measurement accuracy for the Fluke289, Gossen Metrawatt Metrahit Energy and Metrix multimeters MTX3293 tested. knows.