Can the entire sensor unit be submerged in the pool? Not just the cable part?

No, just the cable. We have plans to make a floating sensor for pools, but until then, you need to put the sensor where it will not be submerged. This is not a fully company-encouraged solution but some customers put these in a tupperware style sealed container, drill a hole for the probe, caulk that up, and leave it to float in the pool or hot tub. It's a little DIY and not the best solution but I wanted to share that with you in case that might be an option for you. Enjoy! Eric with YoSmart

Can this be used to measure temp inside a chest freezer? Will signal get out of the chest freezer?

I have this YoLink model inside my chest freezer and refrigerator: Smart Wireless Temperature / Humidity Sensor Wide Range (-22 to 158 degrees) for Freezer Fridge Monitoring Pet Cage/Tank Monitoring Smartphone Alerts, Works with Alexa IFTTT, 2 Pack - Hub Included The model you’re asking about, I have one outside and one in my garage. The model in my freezer and refrigerator works great. If you already have a hub, I don’t see why the model you’re asking about wouldn’t work inside a freezer.

How to replace the two AAA batteries?

Remove 4 small rubber "pads" at the corners. Remove 4 small Phillips screws. Remove cover. Replace batteries. Reinstall.

Can I put this inside a water reservoir to detect when the water reaches a certain height?

We actually have a Water Level Monitoring Sensor that would be much better for your application. It comes with a water-sensitive probe, and the sensor can also work with standard float switches. It's not available now, but before too long we'll also offer a float switch as an accessory. Check it out! https://www.amazon.com/dp/B0BJPWL9L1?ref=myi_title_dp

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Weatherproof Fluid, Air, Surface Extreme High/Low Temperature Sensor with Probe, 1/4 Mile Long Range, YoLink Hub Required

Product ID: 344896727

Details

Age Range (Description)
Adult
Brand
YoLink
Color
White
Connectivity Technology
LoRa
Display Type
Digital
Included Components
1 YoLink 1

💧weatherproof & waterproof

📶1/4 mile LoRa range

🌡️±0.1°C precision

₨29471

Duties & taxes included

In stock

Sold byAmazon Sri LankaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌟 Stay Cool or Stay Warm—Know Your Temps Anywhere, Anytime!

BUILT FOR EXTREMES - Weatherproof design thrives in harsh outdoor and indoor environments.
UNMATCHED WIRELESS FREEDOM - LoRa tech delivers a massive 1/4 mile range—no WiFi needed, no dead zones.
PRECISION AT YOUR FINGERTIPS - Ultra-sensitive 0.1°C/°F resolution for exact temperature tracking.
INSTANT ALERTS ZERO DOWNTIME - Get real-time SMS, push, email, and siren notifications to stay ahead of issues.
PLUG PLAY SMART INTEGRATION - Seamless setup with YoLink Hub unlocks smart home synergy and rapid device pairing.

The YoLink Weatherproof Fluid, Air, Surface Extreme High/Low Temperature Sensor combines industrial-grade precision (0.1°C resolution) with a robust 1/4 mile LoRa wireless range, eliminating WiFi dependency. Designed for versatile applications—from pools and HVAC to livestock and brewing—this sensor is fully weatherproof and battery-powered for reliable outdoor and indoor use. Paired with the YoLink Hub, it offers lightning-fast setup, real-time multi-channel alerts, and seamless smart home integration, making it the ultimate tool for proactive temperature monitoring.

Specifications

ASIN	B08Z3XH313
Additional Features	Waterproof
Age Range Description	Adult
Best Sellers Rank	#20,776 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #14 in Temperature Probes & Sensors
Brand Name	YoLink
Color	White
Connectivity Technology	LoRa
Customer Reviews	4.5 4.5 out of 5 stars (846)
Display Type	Digital
Immersion Depth	0.98 Inches
Included Components	1 YoLink Weatherproof Temperature Sensor, 1 Quick Start Guide
Indoor Outdoor Usage	Outdoor
Item Length	2.44 Inches
Manufacturer	YoSmart
Model	YS8004-UC
Model Name	Weatherproof Wireless Smart Temperature Sensor w/Probe LoRa 1/4 Mile Extreme Long Range
Number of Batteries	2 AAA batteries required. (included)
Outer Material	Plastic
Part Number	YS8004-UC
Power Source	Battery Powered
Product Care Instructions	Wipe Clean
Resolution	0.1°F or 0.1°C
Response Time	500 Milliseconds
Reusability	Reusable
Smart Home Compatibility	Smart Home Compatible
Specification Met	Industry Standards
Style Name	Without Hub
UPC	850024791046
Unit Count	1.0 Count
Upper Temperature Range	158 Degrees Fahrenheit

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