A universal instrument test tool (22 Range, Mark 1) to measure ac/dc voltage, direct currents and electrical resistances. It came with a manual (now lost) and still includes the operating instructions within the lid. Manufactured by Stark Electrical Instrument Company, it was used by the School of Electronics in Toronto's Training and Re-establishment Institute, 1945 - 1948 and likely by Ryerson Institute of Technology's School of Electronics from 1948 into the 1950s. It's serial number is 3051.