The GDS-220 from GW Instek is a GDS-200 series 2 channel digital storage oscilloscope with 200MHz bandwidth. This compact handheld device can be positioned in portrait and landscape display. The recharging battery design makes it easy to operate in laboratories, R&D, large electric system tests, power product tests, motor tests, solar power battery inspection, repair, and maintenance on field assignments. Trend plot in a long period of time can also be drawn allowing effectively monitor standard electric parameters while measuring basic circuit signals. Oscilloscopes have built-in 30000 waveform records replay function which monitors circuits in a long period of time and records which can be replayed repeatedly. An optional differential probe of the oscilloscope can achieve equivalent isolation results for the measurement system and there is no grounding problem. It has a built-in engineering calculator, SMD resistance coding, color coding info & attenuator calculation applications.