How much does this cost to the nearest dollar?

LM YN Plug-Type AC120V Home Digital Voltmeter AC Meter Plug and Play
Introduction： Plug-in digital voltmeter is widely used for AC300V detection (real-time monitoring of the voltage), the voltage meter directly inserted in the plug or plug in the wall switch can immediately display the current voltage (home, office, factory, etc. ). Parameter Measuring range AC voltage AC Measurement accuracy 2%; Dimensions (L * W * H). Screen viewing size 37 × 20.5mm (L * W); Note This meter is only suitable for pure AC power supply, can not be used for square wave, inverter output and modify the sine wave sine wave circuit measurement, otherwise the instrument will be permanently damaged! If you for any reason are not happy with any product

Price is $9.00

Price: $8.99