The ThermoPro Bluetooth Thermometer Hygrometer is a small sensor that sends temperature and humidity readings to the ThermoPro app on your phone every 10 seconds. It logs up to two years of data you can chart and export, and it alerts you when conditions move outside the range you set.
It fits growers tracking a greenhouse or grow space, anyone curing or storing goods that need stable conditions, and RV owners who want compact climate sensors they can hang anywhere. It connects by Bluetooth, so readings come through when your phone is within range of the sensor.
Specifications
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Model: ThermoPro TP351
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Connectivity: Bluetooth with automatic pairing to the ThermoPro app
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Wireless Range: Up to 260 feet
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Temperature Accuracy: ±0.5°F
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Humidity Accuracy: ±2% RH
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Sensor: Upgraded NTC sensor
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Refresh Rate: Every 10 seconds
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Data Logging: Up to two years of stored data with export
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App Features: Temperature and humidity alerts, comfort index, one year charts, battery status, and data export
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Mounting: Built in hanging loop
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Power: AAA batteries, included
Bluetooth Climate Logging for Greenhouses, Curing Chambers, and Storage Within Phone Range
If you run a small greenhouse near the house, keep plants in a grow tent, or cure and store products that spoil when humidity drifts, this sensor gives you readings and a long term record without opening the space to check a gauge.
Hang it at plant height or inside a curing container, set your alert limits, and the app warns you when the space runs too warm, too cold, or too damp. The two year log is where it earns its place, since you can export the data and see exactly when temperatures dipped overnight or humidity spiked after watering.
That history helps you decide whether a space needs more heat, better airflow, or a dehumidifier. It works best where your phone is regularly within Bluetooth range, such as inside the house, an attached garage, or a structure close by.
What to Expect from the ThermoPro Bluetooth Thermometer Hygrometer in Real Use
Setup takes a minute or two. The app is free, no registration is required, and you add the sensor by tapping the plus sign and choosing the model. Purchasers describe the readings as accurate and the app as quick to pull up data. It is being used in cigar humidors, curing containers, multiple rooms, a manufacturing workplace, and on camping trips, and some owners rely on the email data reports and alarms.
Range depends on what sits between you and the sensor. Indoors it covers a whole house for most owners, and outdoors in open air it can exceed the listed 260 feet. Through an exterior wall, range dropped to about 12 feet for an owner monitoring a fig tree wrapped in a tarp with a heat cable, though it still confirmed the plant stayed above a critical 20°F.
There is no screen, and the sensor is small enough to misplace. Connecting to the newest iPhone was occasionally difficult for one user. This setup can help you judge when tender plants need cold weather covers.
Real-world performance notes sourced in part from verified Amazon customer purchases.
Frequently Asked Questions
Does the ThermoPro TP351 have a display?
No. The TP351 has no screen, so you view all temperature and humidity readings, charts, and alerts in the ThermoPro app on your phone. That keeps the sensor small and simple, but it also means you need your phone within Bluetooth range to see current conditions. If you want to read conditions by looking at the device itself, choose a model with a built in display.
Can the ThermoPro Bluetooth hygrometer be used outdoors?
The sensor is designed for indoor spaces, though it measures temperatures down to -4°F, which allows it to track conditions in a sheltered outdoor spot such as under a cover on a protected plant or inside an unheated structure. Keep it out of rain and direct sun. Expect much shorter Bluetooth range when the signal has to pass through an exterior wall, so you may need to stand closer to get a reading.
Do you need an account to use the ThermoPro app?
No. The ThermoPro app is free and does not require registration. Insert the included batteries, open the app, tap the plus sign, and select the TP351 model to add the sensor. Pairing over Bluetooth is automatic, and you can add more sensors the same way to monitor several locations from one app.
