The Multimeter Kit provides you with everything you need to make your own multimeter capable of measuring voltage (0-30VDC, 0.05 resolution) current (0-500mA, 1mA resolution) and resistance (0-100kΩ). The resistance mode also includes a continuity test: the buzzer will sound when the resistance probes are shorted together, this is one of the more handy tools of any multimeter. Using the Multimeter Kit is very straightforward. To measure voltage connect your probes to the 'Voltage' and 'Common' pins, for current measurement the 'Current' and 'Common' pins. Resistance measurement uses the 'Res-1' and 'Res-2' pins. The decimal points are used in resistance measurement mode to indicate 10kΩ and 100kΩ ranges. Project description, more information and ordering can be found at https://www.sparkfun.com/products/10956 ATMega328: http://www.sparkfun.com/commerce/product_info.php?products_id=9061 LM358 Op-Amp: http://www.sparkfun.com/commerce/product_info.php?products_id=9456 3.3V Voltage Regulator: http://www.sparkfun.com/commerce/product_info.php?products_id=526 Red 4-Digit 7-Segment Display: http://www.sparkfun.com/commerce/product_info.php?products_id=9483 Buzzer 2.048 KHz: http://www.sparkfun.com/commerce/product_info.php?products_id=7950 Battery Holder Pack AA x 4: http://www.sparkfun.com/commerce/product_info.php?products_id=552 100uF Capacitor: http://www.sparkfun.com/commerce/product_info.php?products_id=96 10uF Capaciator: http://www.sparkfun.com/commerce/product_info.php?products_id=523 1.0kΩ Resistor: http://www.sparkfun.com/commerce/product_info.php?products_id=8980 10kΩ Resistor: http://www.sparkfun.com/commerce/product_info.php?products_id=8374 SPDT Mini Power Switch: http://www.sparkfun.com/commerce/product_info.php?products_id=102 Push Button Switch: http://www.sparkfun.com/commerce/product_info.php?products_id=97 Banana to Test Probes Pair: http://www.sparkfun.com/products/505 Assembly Instructions: http://www.sparkfun.com/datasheets/Kits/SFE03-0010-KitCard-Multimeter-ReadersSpreads.pdf Source Code: http://www.sparkfun.com/datasheets/Kits/Multimeter%20Kit%20v15.zip Awesome time-lapse assembly video: http://www.modrobotics.com/blog/?p=162