It has a white plastic casing, described as ‘water resistant’. Most customers seem to have found this description accurate, and that the thermometer is not easily affected by small amounts of moisture, be that light rain, or humidity inside the greenhouse.

Calibrate means that you adjust your measuring tool (e.g. thermometer, hygrometer, speedometer, etc.) to give a known value when it's measuring (detecting) that value; you usually do this by adjusting a screw or other mechanism that results in the unit showing a 'reading', or measurement, of that known value on its display or output. This unit does NOT have any calibration adjustment. Some thermometers don’t mention any form of weatherproofing, in which case you should presume that they haven’t got any. For a greenhouse thermometer to be long lasting and effective, it should ideally at least describe itself as ‘water resistant’. the combination thermometer and hygrometer provides a temperature measurement result between -50°C to 70°C, which is available in °C or °F. The measuring range of humidity is between 10% to 99%. The readings are automatically updated every 10 seconds thanks to the built-in sensitive sensors I recommend a digital thermometer over a traditional analogue model . The displays are clearer and easier to read and interpret. You may wish to look for a thermometer that doubles up as a hygrometer (measuring humidity as well as temperature). These give a broader overview of growing conditions.

Testing & Customers Reviews

Separate the device from the power supply or remove the batteries before cleaning. Only use a dry cloth to clean the exterior of the device. Do not use any cleaning fluid to avoid damaging the electronics. Smart Design: Room thermometer indoor features tabletop and magnet mountable design; Celsius or Fahrenheit selector; Powered by AAA battery

Mechanical hygrometer: this measures the contraction and expansion of organic matter that will automatically react in this way to more or less humidity. For example, human hair contracts when it is humid, creating “frizz.” This movement causes a spring to move a needle on a dial.Even though the unit is compact, it still clearly displays humidity and temperature readings. On top of showing the current data, it also shows ‘low’ and ‘high’ readings from the last 24 hours, and indicates whether the humidity is considered ‘dry’, ‘comfortable’ or ‘wet’.