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Model: TP-Link Tapo Smart Temperature and Humidity Monitor | Requires Tapo Hub | 2.7" E-Ink Display | Swiss-Made Sensor | Long-Lasting Performance | Real-Time Notification | Visual Graphics | Tapo T315
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Sort: Lowest to Highest | Last Updated 1/21/2026, 08:39 PM
Does it require hub even to turn it on and just display numbers or only if I want to sync data?
2 Years of Data Export for Free
Does it mean after 2 year have to pay them or does it mean they keep 2 rolling years of data?
Tapo T315 provides high accuracy and real-time data updating every 2 seconds.
It uses e-ink to save power but then updates measurements every 2sec🤦
ChatGPT answer:
1️⃣ Does it require a hub just to turn on and display numbers? Yes — you need the Tapo Hub (H100) even for basic use.
The T315 will not function as a standalone thermometer
It does not have Wi-Fi or Bluetooth
It communicates only via Tapo's Sub-1G protocol → hub is mandatory
Without the hub:
It won't activate
It won't show temperature/humidity
It's basically a dead screen
👉 Think of the hub as the brain — no hub, no readings. 2️⃣ "2 Years of Data Export for Free" — what does that really mean?
This wording is confusing on purpose. What it actually means:
Tapo keeps up to 2 rolling years of historical data
You can export/download that data for free
Older data beyond 2 years is automatically deleted
What it does NOT mean:
❌ It does not mean you must pay after 2 years
❌ It does not mean lifetime storage
❌ It does not guarantee future pricing stays free forever
👉 Right now: no subscription, just a 2-year rolling history limit. 3️⃣ "Updates every 2 seconds" vs E-Ink display — how does that work?
This is the sneaky marketing part. What updates every 2 seconds:
The sensor readings internally
The data sent to the hub/app
Automation triggers & alerts
What does NOT update every 2 seconds:
❌ The E-Ink display
E-Ink refreshes far less frequently (typically minutes or when values change meaningfully).
Why?
E-Ink uses power only when refreshing
Updating every 2 seconds would destroy battery life
So the screen is intentionally "lazy"
👉 Result:
App data = very real-time
Screen = stable, readable, low-power snapshot
This is normal and intentional, not a flaw. 4️⃣ Is the Swiss sensor accuracy legit?
Yes — this part is actually solid.
±0.54°F (±0.3°C) is very good
±3% humidity is on par with premium sensors
Comparable to SensorPush / Govee Pro-grade units
For home, wine storage, gun safes, instrument rooms, baby rooms, or HVAC monitoring, this is more than accurate enough. 5️⃣ Bottom-line verdict (no fluff)
E-Ink refreshes far less frequently (typically minutes or when values change meaningfully).
Why?
E-Ink uses power only when refreshing
Updating every 2 seconds would destroy battery life
So the screen is intentionally "lazy"
Result:
App data = very real-time
Screen = stable, readable, low-power snapshot
This is normal and intentional, not a flaw.
(For comparison) I just blew into my Govee LCD and Govee e-Ink T+H monitors (both transmit on Bluetooth LE). The e-Ink updates every 4 seconds while the LCD updates every 2 seconds. For me it's a non-issue for general use (T+H rarely change that fast, and I'm not using it like some instrument/DMM that needs frequent updating).
The Govee works standalone (display works without app pairing) and I don't see why the Tapo is different (GPT spewing garbage again?). Govee also keeps 2 years of data (though I've never used that feature). Govee is $7-8 each when on sale and I wonder what makes the Tapo so expensive in comparison.
Last edited by FatFaluz December 28, 2025 at 08:55 PM.
(For comparison) I just blew into my Govee LCD and Govee e-Ink T+H monitors (both transmit on Bluetooth LE). The e-Ink updates every 4 seconds while the LCD updates every 2 seconds. For me it's a non-issue for general use (T+H rarely change that fast, and I'm not using it like some instrument/DMM that needs frequent updating).
The Govee works standalone (display works without app pairing) and I don't see why the Tapo is different (GPT spewing garbage again?). Govee also keeps 2 years of data (though I've never used that feature). Govee is $7-8 each when on sale and I wonder what makes the Tapo so expensive in comparison.
I have 3 Govee's H5075 and they are alright. I do wish they would refresh less often to extend batt life. I don't need that kind of temporal resolution to know the temp in my 3 rooms.
And yes, that AI answer is pure trash.
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I have 3 Govee's H5075 and they are alright. I do wish they would refresh less often to extend batt life. I don't need that kind of temporal resolution to know the temp in my 3 rooms.
And yes, that AI answer is pure trash.
Are you using the humidity readings for anything? I just picked up a couple of the Govees to see if I can trigger exhaust fans in bathrooms based on humidity rise, but I'm finding the humidity percentages to be overstated and too much latency in responding to the humidity rise from the shower being on.
Last edited by artcab January 1, 2026 at 12:00 PM.
Are you using the humidity readings for anything? I just picked up a couple of the Govees to see if I can trigger exhaust fans in bathrooms based on humidity rise, but I'm finding the humidity percentages to be overstated and too much latency in responding to the humidity rise from the shower being on.
I calibrated my humidity readings by placing all 3 devices into a large Ziploc bag along with a soda bottle cap filled with a 1/2 table salt and 1/2 water, don't dissolve it, make it a slurry. I double-bagged everything to make sure it's fully sealed and left it in my walk-in closet. That location has the most stable temperature in my apartment, with no sunlight or drafts.
The chemical property of salt and water creates a predictable 75% relative humidity. After letting the sensors settle for 3 days(can be shorter, but I was not in a rush), I used the Govee app to adjust each sensor to read exactly 75%.
Unfortunately, this is a single-point calibration, which essentially moves the entire reading graph up or down (an offset). You are guaranteed accuracy at 75%, but because this doesn't adjust the slope, readings at other humidity levels might still be slightly off. Two-point calibration would be needed to fix the slope, but for a $9 device, this is as good as it gets!
I calibrated my humidity readings by placing all 3 devices into a large Ziploc bag along with a soda bottle cap filled with a 1/2 table salt and 1/2 water, don't dissolve it, make it a slurry. I double-bagged everything to make sure it's fully sealed and left it in my walk-in closet. That location has the most stable temperature in my apartment, with no sunlight or drafts.
The chemical property of salt and water creates a predictable 75% relative humidity. After letting the sensors settle for 3 days(can be shorter, but I was not in a rush), I used the Govee app to adjust each sensor to read exactly 75%.
Unfortunately, this is a single-point calibration, which essentially moves the entire reading graph up or down (an offset). You are guaranteed accuracy at 75%, but because this doesn't adjust the slope, readings at other humidity levels might still be slightly off. Two-point calibration would be needed to fix the slope, but for a $9 device, this is as good as it gets!
Impressive! Thanks for the info. I've settled for a reading of 50% or more over the course of 2 minutes turning "on" a virtual toggle in HA, a 30 minute wait time, and then turning the virtual toggle "off", as a proof of concept test to see how well it tracks the shower being in use.
I'll see how that goes before replacing the dumb fan switch with a smart switch, and update the automation to toggle the smart switch on/off.
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1️⃣ Does it require a hub just to turn on and display numbers?
Yes — you need the Tapo Hub (H100) even for basic use.
- The T315 will not function as a standalone thermometer
- It does not have Wi-Fi or Bluetooth
- It communicates only via Tapo's Sub-1G protocol → hub is mandatory
- Without the hub:
- It won't activate
- It won't show temperature/humidity
- It's basically a dead screen
👉 Think of the hub as the brain — no hub, no readings.2️⃣ "2 Years of Data Export for Free" — what does that really mean?
This wording is confusing on purpose.
What it actually means:
- Tapo keeps up to 2 rolling years of historical data
- You can export/download that data for free
- Older data beyond 2 years is automatically deleted
What it does NOT mean:- ❌ It does not mean you must pay after 2 years
- ❌ It does not mean lifetime storage
- ❌ It does not guarantee future pricing stays free forever
👉 Right now: no subscription, just a 2-year rolling history limit.3️⃣ "Updates every 2 seconds" vs E-Ink display — how does that work?
This is the sneaky marketing part.
What updates every 2 seconds:
- The sensor readings internally
- The data sent to the hub/app
- Automation triggers & alerts
What does NOT update every 2 seconds:- ❌ The E-Ink display
E-Ink refreshes far less frequently (typically minutes or when values change meaningfully).Why?
- E-Ink uses power only when refreshing
- Updating every 2 seconds would destroy battery life
- So the screen is intentionally "lazy"
👉 Result:- App data = very real-time
- Screen = stable, readable, low-power snapshot
This is normal and intentional, not a flaw.4️⃣ Is the Swiss sensor accuracy legit?
Yes — this part is actually solid.
- ±0.54°F (±0.3°C) is very good
- ±3% humidity is on par with premium sensors
- Comparable to SensorPush / Govee Pro-grade units
For home, wine storage, gun safes, instrument rooms, baby rooms, or HVAC monitoring, this is more than accurate enough.5️⃣ Bottom-line verdict (no fluff)
👍 Pros
- Excellent accuracy
- Clear, glare-free E-Ink screen
- Long battery life (realistic ~1.5–2 yrs)
- Free cloud history (2 years)
- Good app + alerts + automation
⚠️ Cons / gotchasWhy?
- E-Ink uses power only when refreshing
- Updating every 2 seconds would destroy battery life
- So the screen is intentionally "lazy"
Result:- App data = very real-time
- Screen = stable, readable, low-power snapshot
This is normal and intentional, not a flaw.The Govee works standalone (display works without app pairing) and I don't see why the Tapo is different (GPT spewing garbage again?). Govee also keeps 2 years of data (though I've never used that feature). Govee is $7-8 each when on sale and I wonder what makes the Tapo so expensive in comparison.
If I wanted slop, I'd ask for that myself.
The Govee works standalone (display works without app pairing) and I don't see why the Tapo is different (GPT spewing garbage again?). Govee also keeps 2 years of data (though I've never used that feature). Govee is $7-8 each when on sale and I wonder what makes the Tapo so expensive in comparison.
And yes, that AI answer is pure trash.
Sign up for a Slickdeals account to remove this ad.
And yes, that AI answer is pure trash.
The chemical property of salt and water creates a predictable 75% relative humidity. After letting the sensors settle for 3 days(can be shorter, but I was not in a rush), I used the Govee app to adjust each sensor to read exactly 75%.
Unfortunately, this is a single-point calibration, which essentially moves the entire reading graph up or down (an offset). You are guaranteed accuracy at 75%, but because this doesn't adjust the slope, readings at other humidity levels might still be slightly off. Two-point calibration would be needed to fix the slope, but for a $9 device, this is as good as it gets!
The chemical property of salt and water creates a predictable 75% relative humidity. After letting the sensors settle for 3 days(can be shorter, but I was not in a rush), I used the Govee app to adjust each sensor to read exactly 75%.
Unfortunately, this is a single-point calibration, which essentially moves the entire reading graph up or down (an offset). You are guaranteed accuracy at 75%, but because this doesn't adjust the slope, readings at other humidity levels might still be slightly off. Two-point calibration would be needed to fix the slope, but for a $9 device, this is as good as it gets!
I'll see how that goes before replacing the dumb fan switch with a smart switch, and update the automation to toggle the smart switch on/off.
Leave a Comment