A digital oscilloscope is an absolute necessity in today’s system tuning and OEM integration challenges. Technicians will appreciate these value priced, single channel scopes that are easy to use and easy to read. The TPI 440 is a 1MHz scope that has a very familiar DMM user interface with traditional shielded banana test leads. There is virtually no learning curve with the TPI 440. It has an internal Ni-Mh battery with a wall charger included. The Velleman HPS-10 is a 10Mhz scope with all menu driven controls and a shielded BNC x1/x10 probe. It’s powered by 4 AA batteries.