I have a small unit made by AcuRite. It comes with one remote and you can buy others. It will connect with up to three. It has a temp alarm function. I have one in the service bay and one in the refrigerator. Cost was about $19 at Walmart.
Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.