Can be used to check the water for a baby bath?

I dont see why not, however any electronic device could fail so you need to take precautionsand be vigilant in case the device fail on an unexpected way. Always double check readings and use an elbow in the water as a referance. Always be on your guard as an accident can be very serious.

Are these suitable for measuring the freezer temperature using the probe - so temperatures as low as -30 degrees C?

Hello, you can use the probe to measure the temperature of the freezer compartment as low as -30 degrees Celsius, but it is not recommended that you keep the thermometer and probe at this temperature for a long time, because this will reduce the battery life of the thermometer.

Could these be used in guitar cases to measure humidity?

These are just thermometers for temperature only. What you require is a hydrometer a different device entirely but there are probably small ones available. I am sure there are combined ones with both humidity and temperature displays.

Is there a way to calibrate the thermometer. mine shows 96.5 deg. c in boiling water at 100m above the sea level. it should be 99.7. how can i adjust?

Boiling temperature depends on atmospheric pressure. Pressure may rise and fall as much as 50mb with changes in weather. At 100m pressure is about 11mb less than at sea level. So low atmospheric pressure may be at least part of the explanation.

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Thlevel Fridge Reptile Thermometer Probe Temperature Gauge | for Freezer Refrigerator Aquarium 4 Pack Black

Product ID: 153614283

Details

Age range (description)
baby
Brand
Thlevel
Colour
4x Black
Display type
Digital
Included components
Stack
Outer material
Metal

📏Compact 48x28x15 mm size

🔋Long-lasting 2x LR44 batteries

🌡️Wide -50℃ to +110℃ range

R513

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Description

🌡️ Stay cool, stay precise — your climate’s new best friend!

VERSATILE USAGE - Ideal for fridges, counters, aquariums, and more
RELIABLE DURABLE - Strong interference suppression and freezer-safe build
CLEAR DIGITAL DISPLAY - Easy-to-read LCD ensures instant temperature checks
SLEEK PORTABLE DESIGN - Minimalist, moisture-resistant body fits anywhere with style
PRECISION TEMPERATURE CONTROL - Accurate ±1.0℃ readings for perfect climate monitoring

The Thlevel Fridge Reptile Thermometer Probe offers precise temperature monitoring from -50℃ to +110℃ with ±1.0℃ accuracy. Its compact, moisture-resistant design fits seamlessly in any indoor environment, powered by two LR44 batteries for reliable, long-lasting use. Perfect for refrigerators, aquariums, and counters, it combines style and function to keep your space perfectly climate-controlled.

Specifications

ASIN	B07TY6HRL4
Age Range Description	baby
Best Sellers Rank	5,569 in Garden ( See Top 100 in Garden ) 51 in Thermometers & Meteorological Instruments
Brand	Thlevel
Colour	4x Black
Country Of Origin	China
Customer Reviews	4.4 4.4 out of 5 stars (8,464)
Display Type	Digital
Immersion Depth	100 Centimetres
Included Components	Stack
Indoor Outdoor Usage	Indoor
Item Length	4.8 Centimetres
Manufacturer	Thlevel
Manufacturer Part Number	188048
Model Name	Termómetro Digital Mini
Model Number	188048
Number of Batteries	2 LR44 batteries required.
Outer Material	Metal
Power Source	Battery Powered
Product Care Instructions	Freezer Safe
Resolution	0.1 °C
Reusability	Rechargeable
Special Features	aquarium thermometer, freezer thermometer, fridge and freezer thermometer, refrigerator thermometer
Specification Met	CE
Style Name	Contemporary
Unit Count	1.0 count
Upper Temperature Rating	70 Degrees Celsius

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R513

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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