1-11/16" gamma ray tool. Standard GO monocable head top and bottom.

The GRT-3 Gamma Ray Tool is a standard scintillation detector type production gamma ray tool housed within an in line GO body. The GRT-3 has been designed to run on the end of an analogue ESR-1 tool string. However as the tool is through wired it can also be used in conjunction with any compatible monocable tool string.