For sale is a 1956 Tesco phase angle meter. It has inputs for 60 VAC, 120 VAC, and 240 VAC, and inputs for 1A, 2.5A, and 5A. I have checked it with 120 VAC and 60 VAC and five to two Amp Capacitive and Inductive loads, and it seems to function well. The pictures show a small capacitive and inductive load almost unity, and the same loads with the leading edge of the Voltage swapped to the other input so they are 180* out. It appears the unit was made in 1956 and sold in 1958, and is in excellent cosmetic and mechanical condition. As can be seen in the photo's the price for Cat. No. 648 in 1958 was $400. These are still made by Tesco with a catalog number of 646; the units are almost identical. The meter weighs 18 1/2 pounds with leads.