The TB7-9-PTD is a circuit board made by Heeger, a manufacturer of sensing and control products. It is a Pressure Temperature Differential (PTD) module designed to measure flow, pressure and temperature conditions in a control system. It features a microcontroller-based pressure, temperature and differential (PTD) measurement system, capable of monitoring a wide range of pressure and temperature ranges. It features a 4-line LCD display and can be configured with a variety of sensors and transducers, allowing for a number of custom functions and applications. It is a simple, reliable and cost-effective solution for monitoring in control systems.