Thermo-Hygrometer (RT817E)

Rated 4.7 out of 5
Read 55 Reviews|25 Questions, 678 Answersor
SKU: RT817E
Thermo-Hygrometer (RT817E)
Sale Price: $45.00

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Large dual display, external temp sensor, foldaway stand, for the office or home, temp and humidity.
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2-year Warranty

  • Large digit display for humidity and temperature
  • Max/Min memory
  • Ice point alert
  • Outdoor temperature display
  • °C/°F switchable
  • Foldaway stand
  • Mounting keyhole

Perfect for home, office, and factory, our new RT817E displays indoor and outdoor temperature as well as indoor humidity. Each unit ships with an external temperature sensor with 10 feet of cable to measure temperature in a remote location.

Mount your new RT817E on the wall or on the desk with its convenient wall mount or fold-out stand. With large 1 inch digits you'll have no trouble reading the current display.

The RT817E records Min and Max temperatures as well as an ice point alarm for use with the remote probe. Set the alarm to ON and you'll be alerted when the outside temperature drops below 32°F (0°C).

Each unit includes a AAA 1.5V battery, wall bracket, remote sensor, and operating instructions. The RT817E is a professional tool at an affordable price.

55 Ratings
4.7out of 5 stars
55 Ratings

Rated 5 stars by 82% of reviewers

Rated 4 stars by 13% of reviewers

Rated 3 stars by 2% of reviewers

Rated 2 stars by 2% of reviewers

Rated 1 star by 2% of reviewers

1-10 of 55 Reviews
Rated 5 out of 5
Jan 6, 2025
Keeps my orchid collection happy!
I have two of these in use in my orchid growing area to monitor temperature and humidity. The units are in opposite corners but are in close agreement with each other (some variability expected due to size of area and air movement, etc.). They have helped me improve health of my plants.
P S
Rated 5 out of 5
Apr 24, 2024
A very reliable thermometer
Works like a charm. It replaces our old mercury thermometer which was hard to read especially in the evening and during the winter.
MARSHA O
Rated 5 out of 5
Feb 8, 2024
Love the large display!
Love the large display! I use this for my mini-fridge. It's perfect!
Patti
Rated 5 out of 5
Jul 13, 2023
Probe / Temperature / Humidity
It would be fantastic if the probe displayed both temperature and humidity. I make various ages meets, salami, etc. It would work extremely well if it had that capability.
Henry E
Rated 4 out of 5
Apr 17, 2023
Temp on bottom
Works great but from a design standpoint my expectation is the temperature should be on top.
ALEX G
Rated 5 out of 5
Jan 31, 2023
Great value, accurate,
louis m
Rated 4 out of 5
Dec 23, 2022
Nice big numbers
The numbers are easy to read and works great for indoors. The outdoor probe is nice, but you need a hole to put it through and doesn't work well with storm windows. It would be nice to have a probe that works remotely.
DONALD M
Rated 5 out of 5
Dec 21, 2022
Great Product
I like having both numbers visible on the display. It seems very accurate.
DARRYL S
Rated 4 out of 5
Dec 20, 2022
Great but without legible instructions.
It works fine but I could not get started because the text giving directions is in such small print and in white on a shiny silver background so it is very difficult to read. Impossible for me. I had to call to be told how to make it work, which was ridiculously easy, but without instructions was not easy at all. Since I did not need any alarms, I just did the following.
1. Removed the plastic cover.
2. pressed the F/C button in back to select Fahrenheit.
3. pressed the power button in the center of the front.
4. inserted the probe and waited for the temp and humidity to register correctly.
DEANNA N
Rated 3 out of 5
Dec 20, 2022
Hydrometer is not in the probe
There is only one hygrometer, and it's not in the probe, but in the base unit. There are two thermometers, one in the unit and one in the probe.
ALLAN A
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25 Questions
Why did you choose this?
ThermoWorksStore

It's practical.

CHRISTOPHER H

Setting it up at my home

DEVON B

Need it for my onsen.

MICHAEL M

I have one and like it so much that I purchased 2 more as gifts.

DAVID N
Would this item function well in a cigar humidor? It seems very difficult to find a hygrometer that functions well in a cigar humidor.
William S

I was just thinking this would be perfect for the tall cabinet humidor I’m planning to build in the not too distant future. I absolutely trust the Thermo Works brand!

Charlie P.
Could I use this in an egg incubator? We have had the worst luck with inaccurate units from other makers.
mary m

In general, nothing about an incubator would be problematic, as long as you use the Thermo Hygrometer (RT817E) within temperature and humidity guidelines within a non-condensing environment. We recommend that you speak with our Technical Sales team if you have additional questions. You may contact them by emailing sales@thermoworks.com or by calling 1-800-393-6434.

Rozanne P
Does the remote probe of the thermo-hygrometer show only temperature, or does it also monitor humidity remotely? Wondering if this would be effective to sit on top of a gun safe and use the wire to remotely monitor the interior temp and humidity.
Brian J

The remote only displays the temperature data. The device itself displays both the temperature and humidity data.

Rozanne P
Can I use the thermo-hygrometer without the external probe? I only need to measure temperature and humidity where I place the unit.
Greg D

Yes. The probe is typically used as an ice-point alert or for outdoor temperature. If that is not needed, the probe does not need to be plugged in for the base unit to operate properly.

Amanda M
Is it OK to leave the unit on all the time? Why an on-off button?
NANCY W

Yes, it is alright to leave the unit on all of the time. It includes an On/Off button as some people only want to temporarily take measurements.

One example: While on a RV vacation, you may want to measure the temperature outside while you are parked in a high-altitude campground (as it may get very cold there), while also measuring the humidity temperatures inside the RV while running your propane heater (which generates a lot of humidity). Before you move your RV to a new location, you'll want to turn off the unit and bring the temperature probe inside.

Rozanne P
I'm looking to cure my own meats for charcuterie, would this be an ideal sensor that can be placed in a wine chiller or refrigerator? If not, which would be better suited?
Craig B

Many customers have used the Thermo Hygrometer (RT817E) in this manner. Just make sure you keep it within the temperature range as follows:
Indoor: 32 to 122°F (0 to 50°C)
Outdoor: -58 to 158°F (-50 to 70°C)

Rozanne P
How are users getting the probe outside as it is not remote?
Do you have to drill a hole or?
JOHN A

I ran the cable out a window, between the window frame and window (just closed the window on top of the cable). Then I connected the probe mount to the outside wall of my house. Works just fine.

Andrew H
Is the temp & humidity adjustable to allow for it's age over time?
GARY R

The calibration is not adjustable. To keep it reading accurately, we recommend keeping the sensor area clean and free of dust buildup.

Amanda M
Can I attach a magnet to the back of this for mounting onto a fridge or will that interfere with how this unit functions?
Btcall

Attaching a magnet to the back of this device will not affect the function at all.

Bradford W
Is this unit NIST traceable?
Trey D

Hi Trey,

The Thermo Hygrometer is not NIST Traceable. If you are looking for something that can measure both temperature and humidity with NIST Traceability, I would recommend taking a look at our RH SPOT™.

The RH SPOT™ can be found at: https://www.thermoworks.com/rh-spot/

If you are looking for something in particular, feel free to give us a call at 800.393.6434. We are happy to help find the best product for your needs.

Taylor W

Thermo-Hygrometer (RT817E)

$45.00

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