I have a new azel DS-60P temp gauge with 2 probes that does not work at all. There were no directions with the unit so I got some info online but to no avail. The probe wires are hooked up correctly and the battery seems good but the read out only displays LLL. I tried one probe on a heat source and the other on a cool area and vice versa. Used the reset button but nothing changes,took battery out and replaced,held reset for a few seconds but no difference. Still reads LLL on both in and out displays. Any ideas or should I return it? Thanks