Velleman PMLCD 9VDC LCD DIGITAL PANEL METER display: 3 1/2-digit LCD input sensitivity: 200mV FS power supply: 9V DC (7 - 12V DC decimal point selection: with wire jumper automatic polarity indication figure height: 0.52" sampling rate: 2 - 3 readings / sec. guaranteed zero reading for 0V input high input impedance: &gt; 100Mohm accuracy:  0.5% power consumption: 1mA DC size: 2.7" x 1.7"