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Depending on the setting of the device, each one has a maximum limit based on a temperature range. Here are the limits for each range. Range 1: 68 -106°F max temp 161°FRange 2: 106 -147°F max temp 202°FRange3: 147 - 183°F max temp 228°FRange4: 183 - 228°F max temp 283°F Range5: 228 - 284°F max temp 339°F Example: The limit on a setting of 75°F can be found in range 1. 68 - 106°F, maximum limit is 161°F. So the maximum temperature the sensor can see is 161F.