Sinometer MS8211 Digital MultiMeter Pen-Type Non-Contact AC Voltage Detector for $25.90
The Sinometer MS8211 is a pen-type digital multimeter with non-contact AC voltage sensor, it can measure AC/DC Voltage, Resistance, Diode and Continuity test. Its unique non-contact AC voltage sensor is a great feature for electric inspection, the maximum detection distance can be as far as 6 inches depending on the adjustable sensitivity.
This looks like something I would use, but after $4.99 flat rate shipping it is actually cheaper to get it on Amazon if you have Prime.

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