We’ve had situations where we want to watch a voltage, but don’t want to dedicate or mount a full meter to the projects. This little device fills the need. Small, compact, self-powered and inexpensive, it lets us watch for system voltage sags without using up our bench meters.

If you have to install it a distance from your measurement point and you are concerned about voltage drop, there is a trimmer on the backside so you can dial in the compensation for the line loss powering the display. That said, please calibrate your unit before using it!

Features:

• Self-powered
• Up to 30VDC input
• SMALL, but bright!
• Green display
• Voltage calibration trimpot

Specifications:

• 2.5-30VDC input
• 28mm (1.1″) between 2mm (0.08″) mounting holes
• ~500mS refresh rate
• 1% (+ / – 1 digit) accuracy
• -10 to +65°C operating temperature
• 5g
• 23 x 15 x 10mm (0.91 x 0.59 x 0.39″), excluding mounting tabs
• 150mm (5.9″) power leads