TP-TTL Series Optical Probe is designed with TTL interfaces in 2013 by Tespro China. The up-to-date technologies and the general application property for almost all kinds of electric meters and thermo meters, which makes it very unique among the Tespro China optical probe families.The TP-TTL series optical probe is powered by an extermal power source, supports different types of connectors, and accepts customized plugs from customers.