The Temperature/Water Hold-Up/Flow Logging Tool (HTF02) is an instrument that integrates three types of sensors and electronic components into a single short section for measuring well temperature, water hold-up, and flow rate. The electronic circuitry processes the signals from the three sensors. The lower end of the instrument is connected to the flowmeter mechanical body for flow rate measurement. Depending on the logging requirements, either a continuous flowmeter mechanical body or a full-bore flowmeter mechanical body can be selected.

The instrument has a simple structure and is easy to operate.