A look inside and calibration attempt!!!
A review of the 50 000 / 500 000 count Amprobe True-rms Precision Multimeter with Temperature.

Buy on Amazon: http://astore.amazon.com/m0711-20/det…
Buy Extech MM560A: http://www.tester.co.uk/extech-mm560a…

Details:
http://www.amprobe.com/amprobe/usen/M…

The Amprobe AM-160-A offers more features and better accuracy at a great price. Precise true-rms, accuracy to 0.02%, frequency, capacitance, duty cycle, temperature, analog bar graph, PC interface and large backlit displays are just a handful of features that are available on this precision multimeter. True-rms Precision accuracy to 0.02% Measurements: voltage up to 1000V AC/DC, resistance, AC/DC current, frequency, capacitance, duty cycle Dual temperature Optical isolated PC interface capability Crest (peak hold), max, man max-min recording Auto and manual ranging Intelligent auto power off Data hold Relative zero mode Audible and visual warning against improper plug-in DC loop current 4-20mA dBm reading with 20 selectable impedance values Backlight display Large, easy to read large LCD display High speed analog bar graph Diode test 4-20mA DC loop current Audible continuity