Great product at a great price. I really like this product! I use it to control my robot's NiMh battery (as shown below). BTW: 1) When it is on, pressing the button on the bottom changes the mode from % to volts 2) Pressing the button on the bottom When turning on the power, you enter the programming mode / calibration. Some of the things I can do in this mode range) Turn the backlight on/off b) Recalibrate the device to show what the current voltage is, like a new 100% full calibration. I really like this item! I use it to monitor my robot's NiMh battery (as shown in the image below):
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