The RTR-501 series by T&D Corporation is a wireless temperature data logger which comes which comes with a compact and durable design. For this specific model, it comes with a housing that is water proof and dust proof which is ideal for all types of applications. Also, it is supported with an internal sensor which enables maximum performance even in water and dust environmental operation. This is the ideal tool to use for condition which is harsh. For its wireless communication range, it has a maximum distance of 150 meter [500 ft]. It can expand it wireless communication range by simply registering the unit as a repeater.