Traceable® Signaller shows current, minimum, and maximum displays and includes a settable high/low alarm for all four readings (dew point, wet- bulb, humidity, temperature). Alarm may be set in 0.1 increments. It sounds for one minute and red LED flashes until readings return to non-alarm condition. Range is 1 to 99% relative humidity with a resolution of 0.1% and an accuracy of ±4% between 20 to 80% RH. Temperature range is –40 to 70°C and –40 to 158°F with a resolution of 0.1° (below 100) and an accuracy of ±1°C.