The listing, Etekcity MSR-R500 Digital Multimeter - New has ended.
Voltmeters are good things to have handy for checking why your electronic stuff is dead (test for an open circuit) etc. I took an electricity course in High School and a computer courses later that taught you how to use these things. This is a good cheap one.
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Description from Amazon:
The Etekcity MSR-R500 Digital Multimeter is a practical tool for electricians, hobbyists, and general household use. It is easy to operate and features many different functions for measuring current, voltage, and resistance, as well as continuity, transistor, and diode testing. It can be used to diagnose, assemble, and repair circuitry and wiring. Other features include a low battery indicator, continuity buzzer, and overload protection.
Features
1.Accurately measures current, voltage, resistance, and more
2.Backlit LCD with large digits for visibility in dimly lit areas
3.Includes 9V battery and pair of test leads
4.Small size for portability - Perfect for use while on the go
5.Displays results quickly with 2-3 readings per second update speed
Specifications
* Safety/Compliances: IEC61010 CAT.I 600V, CAT.II 300V, double insulation
* Max.display: 1999, 3 1/2 digits
* Range selection: Manual ranging
* Overload display: Display OL
* DC Voltage: 200mV/2000mV/20V/200V ±(0.5%+2), 500V (0.8%+2)
* AC Voltage: 200V/500V ±(1.2%+10)
* DC Current: 2000μA/20mA ±(1%+2), 200mA ±(1.2%+2), 10A ±(2%+5)
* Resistance: 200Ω ±(0.8%+5), 2000Ω/20KΩ/200KΩ ±(0.8%+2), 20MΩ ±(1%+5), 200MΩ ±[5%(reading-10)+10]
* Diode Test: Yes
* Continuity Test: Yes
* Square Wave Output: Yes
* Dimensions: 5.1" x 2.9" x 1.4"
* Power: 1 x 9V 6F22
Package Includes
1 x Etekcity MSR-R500 Digital Multimeter
2 x Test Leads (pair)
1 x 9V Battery
1 x User's Manual