GW Instek GDM-8255A/8251A portable precision multimeters engage with 5 1/2 digits, dual-display, 0.012% high DC voltage accuracy and various advanced measuring function to make electrical relative signal measurement faster and easier. In addition, the standard RS-232 and USB device make the GDM-8255A/8251A an ideal tool and inexpensive solution for field service, development/maintenance, education and ATE system applications. The GDM-8255A/ 8251A provides 9 major measuring functions such as DCV/ACV, DCI/ACI, 2w/4w Resistance, Diode, Frequency, Continuity test and Temperature. The 0.012% DC voltage accuracy provides user the best measuring precision at the DC voltage applications. In addition, there are several advanced measuring functions such as Max, Min, dB, dBm, REL/REL#, Hold, Compare and Math functions to enhance the serviceability of measuring results.