Self-powered 3 digit, led display AC line voltage monitor
A component-size, self-contained, low-cost AC voltmeter for true line measurements. It requires no additional components or auxiliary power.
Brand name(s) : Murata Power Solutions

Features
Screw terminals for panel mounting
Small 1.38" x 0.88" x 1.0" packages
Large, easy-to-read, red, blue or green LED displays
Fully encapsulated for harsh environments
Half-wave averaging, RMS calibrated
UL, CSA and IEC1010-1 certified
Very low cost!