Choosing a Thermometer Hygrometer for Storage and Production

Start with the stated tolerance

Almost every thermo-hygrometer on the market reads temperature and humidity. The difference is whether the supplier will tell you how accurately. A useful specification separates indoor and outdoor humidity — ours are typically quoted as 10% to 99% at ±5% indoor and 1% to 99% at ±3% outdoor — rather than quoting one number for both. If a datasheet gives a range with no tolerance, you are buying an indicator, not an instrument.

Alarms are what make it useful

A reading nobody is watching at 3 a.m. changes nothing. High and low alarms on temperature and humidity are what turn a display into monitoring. Check whether alarms are per channel or global; on a multi-cabinet site, one global alarm setting is close to useless.

Max and min memory

Max/min memory tells you what happened while nobody was there. Look at how it clears — on our consoles either manually or automatically every 24 hours — because a memory that silently resets when you are not watching answers no questions.

Channels

If more than one place matters, count them before choosing the console. Most of our thermo-hygrometer consoles take up to eight remote sensors on dip-switch channels. Buying a single-point instrument per location costs more and gives you eight screens to read.

Probe or ambient

Ambient units measure the air around them. Probe units measure whatever the probe is in — a fridge cabinet, a freezer, a product, a liquid. For cold storage the probe version is usually the correct answer, because it keeps the display outside the cold space where somebody can actually read it.