The Thermometer World Digital Greenhouse Thermometer shows the current temperature along with the highest and lowest readings recorded since you last reset it. That max and min record tells you how cold your greenhouse dropped overnight and how hot it climbed in the afternoon, without you checking it around the clock.
It fits greenhouse growers, allotment keepers, and anyone tracking temperature swings in a garage, shop, or attic alongside other greenhouse temperature gauges. Readings display on the unit itself, so it works as a standalone gauge rather than a connected sensor.
Specifications
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Thermometer Type: Digital maximum and minimum thermometer
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Readings Displayed: Current, maximum, and minimum temperature
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Display: Large LCD screen with digits about 1 inch tall
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Units: Switchable between Celsius and Fahrenheit
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Environment: Indoor and outdoor use
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Power: One AA battery, included
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Controls: Clearly marked side buttons for resetting max and min and changing units
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Screen: Ships with a peel off protective film
Tracking Overnight Lows and Afternoon Highs in Greenhouses, Cold Frames, and Outbuildings
If you are trying to decide when to throw frost cloth over tender transplants or whether your greenhouse needs a supplemental heater through the coldest nights, the minimum reading answers that question with a number instead of a guess.
The maximum reading does the same job in summer, showing you how hot the space gets with the door closed so you know when to add shade or open up more airflow. Resetting the readings each morning gives you a daily range, while leaving them alone for longer shows the extremes over a stretch of weather.
Because it runs on a single AA battery with no wiring or app, you can hang it anywhere you need a reading, from a hoop house to a seed storage room or an unheated shed.
What to Expect from the Thermometer World Digital Greenhouse Thermometer in Real Use
The large display is the most praised feature. Purchasers describe reading it from about 16 feet away and checking an attic from the hatch without climbing in. Owners use it in a small greenhouse, garage, workshop, attic, and living spaces, and several bought multiple units after the first.
Accuracy comparisons against other thermometers were generally consistent, though a separate unit read about 2 degrees higher than a second gauge. Those switching from dial or liquid column thermometers found it easier to read.
Battery life has run past eight months on the original AA. The battery cover can pop off with a light bump, sometimes taking the battery with it, and a strip of tape on the back holds it in place. A unit that failed after 10 months was replaced by the company under its two year warranty. The side buttons make clearing the high and low readings quick, which helps if you want to track conditions in a shed or storage building day by day.
Real-world performance notes sourced in part from verified Amazon customer purchases.
Frequently Asked Questions
How do you reset the min and max on the Thermometer World greenhouse thermometer?
Press the marked reset button on the side of the unit. The stored maximum and minimum readings clear, and the thermometer starts recording new highs and lows from that moment. If you want a daily range, reset it at the same time each morning. If you want to see the extremes across several days or a full cold snap, leave it running and reset only when you have noted the readings.
Can you leave a digital greenhouse thermometer outside all year?
This thermometer is rated for both indoor and outdoor use, so you can mount it in a greenhouse, cold frame, or outdoor spot through the seasons. Hang it where it reads air temperature rather than direct sun hitting the case, which can push the maximum reading higher than the actual air temperature. If it hangs where it might get knocked, a piece of tape over the battery cover keeps the battery seated.
Does the Thermometer World digital thermometer come with a warranty?
Yes. Thermometer World backs this thermometer with a two year warranty. If the unit stops working within that period, contact the company's customer service team with your order details, and they can arrange a replacement.
