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

It does what it intends but due to some issues I wouldn't buy it again. The problem is that the acrylic comes without the protective paper removed from the case. To remove the paper you have to completely disassemble the device, which then shows you how awful it is. After all that, you'll find that by design, the battery will die in a matter of weeks, even if you turn off the switch. I ended up just charging it all the time.