Best Thermometer Hygrometer for a Grow Tent

Temperature and humidity are the two numbers that tell you whether a grow tent is working. The thermometer on your controller or the display on your fan may give you one or both. A separate sensor at plant height gives you a second opinion, and a logging sensor shows what happened at 3 a.m. when the light switched off.

This guide compares three widely sold thermo-hygrometers from their published specifications: a logging Bluetooth sensor, a Wi-Fi sensor and a simple display unit. We did not test them ourselves, and we found no independent accuracy measurements for these models to cite.

What to compare

• Rated accuracy, and the range it covers. Brands often quote their best-case figure. SensorPush and ThermoPro both say accuracy is looser outside their main humidity range.
• Logging. A sensor that stores readings lets you see overnight swings. A display only shows the present moment and, at best, a high and low.
• Alerts and remote access. Wi-Fi lets your phone warn you when the tent drifts out of range while you are away. Bluetooth-only sensors need you nearby, or a separate gateway.
• VPD. Vapor pressure deficit combines temperature and humidity into one number. SensorPush calculates it in its app.
• Durability. A grow tent is warm and humid. SensorPush’s HT.w adds a sensor membrane and O-ring seals for splash resistance.

Specs side by side

	SensorPush HT.w	Govee H5179	ThermoPro TP50
Temperature accuracy	±0.2 °C typical (0–60 °C); ±0.6 °C typical full range	±0.3 °C (±0.54 °F)	±0.5 °C (±1 °F)
Humidity accuracy	±2% typical, ±4.5% max (10–90% RH at 25 °C)	±3% RH	±2% (30–80% RH), ±3% otherwise
Readings	Every minute	Every 2 seconds	Every 10 seconds
Storage	45 days on the sensor	20 days online view; export up to 2 years	High/low records only
Connectivity	Bluetooth, 100 m line of sight; optional G1 Wi-Fi gateway	2.4 GHz Wi-Fi and Bluetooth	None
VPD in app	Yes	Not stated	No app
Power	CR2477 coin cell, typically over 2 years	3 AA, about 7 months (Govee FAQ)	1 AAA
Water resistance	Yes (membrane and O-ring seals)	Not stated	Not stated

Figures are from each brand’s own product or comparison page, checked November 14, 2026.

SensorPush HT.w

SensorPush rates the HT.w at ±0.2 °C typical and ±0.4 °C maximum between 0 and 60 °C, ±0.6 °C typical across its full -40 to 60 °C range, and ±2% typical and ±4.5% maximum humidity accuracy from 10% to 90% RH at 25 °C. It takes a reading once a minute, stores more than a month of data on the sensor (45 days in SensorPush’s comparison table) and pushes it to the app, where you can set alert ranges and see dewpoint and VPD. The sensor runs on a CR2477 battery that SensorPush says typically lasts over 2 years.

Two notes from SensorPush’s own page matter in a tent. The HT.w adds a sensor membrane and O-ring seals for splash resistance. And prolonged exposure above 80% RH may create an offset of up to +3% in its readings, which reverses once humidity drops below 80%. On its own the HT.w is Bluetooth-only; remote alerts away from home need SensorPush’s G1 Wi-Fi gateway.

Govee H5179 Wi-Fi Thermo-Hygrometer

Govee lists ±0.3 °C (±0.54 °F) temperature accuracy and ±3% RH humidity accuracy, a reading every 2 seconds, and both Wi-Fi and Bluetooth connection through the Govee Home app. You can set temperature and humidity ranges for app alerts, view 20 days of data online and export up to 2 years of history. Govee says the app supports calibration. It runs on three AA batteries, which Govee’s FAQ puts at about 7 months, and it works only with 2.4 GHz Wi-Fi.

It is the simplest way to get remote alerts without a separate hub. Govee’s page notes that alert settings are configured over Bluetooth.

ThermoPro TP50

The TP50 is a plain digital display. ThermoPro lists ±1 °F (±0.5 °C) temperature tolerance, ±2% RH between 30% and 80% RH and ±3% outside that range, a 10-second refresh, high and low records, a Dry/Comfortable/Wet indicator, and a tabletop stand, magnetic back and hanging mount. It runs on one AAA battery and has no app or wireless connection.

It suits a tent you check in person every day, or a second reading to sanity-check a controller’s sensor.

Placement and checks

• Canopy height, shaded. Put the sensor where the plants are, out of direct light, which can heat the sensor and skew the reading.
• Out of the airflow. Keep it away from the clip fan’s direct stream and any humidifier or dehumidifier outlet.
• Watch lights-off. The tent cools and humidity often rises when the light switches off. A logging sensor shows this. See dehumidifiers for grow tents if it climbs too high.
• Compare two sensors. If your controller and your hygrometer disagree by more than their rated tolerances, one of them needs calibrating.

Humidity and heat are mostly managed by exhaust. Our inline fan guide covers sizing, and LONGWELL’s formulas size the fan for the light’s heat load. For the other meter a hydroponic setup needs, see pH meters for hydroponics.

How these picks were made

We compared sensors at three levels (logging Bluetooth, Wi-Fi, simple display) on published accuracy, logging, connectivity and power, using only each brand’s own specifications. We did not test these sensors ourselves; see how we research.