I bought this thermometer in Aug 2025. It came with a dead battery which we replaced but to no improvement! The unit does not operate as the instructions state, instead an "L" comes on the screen and stays. Only by double clicking the power button does the thermometer seem to go to a mode that makes it usable by finally showing the correct temperature. Additionally, it shifts to celsius without being asked to and is hard to change back. Finally when we asked the staff but they had no recommendation or understanding of dog thermometers and offered no advice on purchase or operation. When your dog is sick and you need equipment to monitor their condition the last thing you want is bad or inaccurate equipment or unknowledgeable sales folks. This is a NO buy.