ThermoPro TP50 Temperature and Humidity Monitor
The cheapest way to find out what your room does
Find out what your bedroom actually does before you spend anything on fixing it.
Researched from manufacturer specifications and published expert reviews
Best forFinding out what your bedroom actually does overnight before spending on any fix.
Opens Amazon in a new tab · this page stays open
Affiliate link. We earn a commission on qualifying purchases at no extra cost to you. Amazon changes prices often, so we link to the listing rather than repeat a figure that could be wrong by the time you read it. How this works.
Almost every recommendation on this site starts with measuring the room, and this is the cheapest way to do it. It shows current temperature and humidity plus the highs and lows since you last reset it — which is the part that matters, because the number that affects your sleep is the one at 4am, not the one you read at bedtime.
What's included
- ThermoPro TP50 unit
- Battery
- Stand and mounting options
The Deep Dive
Why measuring comes first
Most sleep purchases are made on a hunch about which thing is wrong. People buy blackout curtains for a room whose real problem is that it sits at 24°C, or a cooling blanket for a room that is already cold and simply dry. A week of readings turns an expensive guess into a cheap answer.
It is also the fastest way to rule things out. If your room holds 18°C and 50% humidity all night, temperature and air are not your problem and you can stop spending money on them.
Read the minimum and maximum, not the current number
The reading at bedtime is the least informative one available: you are awake, the door has been open, the room has not yet filled with two sleeping bodies. Reset the memory at night and read the high in the morning. That gap is often several degrees, and it is where the fragmented second half of the night comes from.
Where to put it
At mattress height, near where your head goes, away from a radiator, a window and any vent. A unit on a high shelf reads the warmest air in the room, which is not the air you are breathing. This matters more than the accuracy of the device.
What it cannot tell you
It measures the room, not the bed. The space under a duvet is a separate climate, often five to ten degrees warmer than the air, and two people under the same duvet can experience it completely differently. If the room reads correctly and you are still overheating, the bedding is the next thing to change.
At a glance
- Who is it for?
- Finding out what your bedroom actually does overnight before spending on any fix.
- Who should skip it?
- You already know your numbers and need to act on them rather than measure again.
- How we assessed it
- Manufacturer specifications and published independent reviews. We have not tested this product ourselves.
The numbers
Specifications
- What it is
- Digital thermometer and hygrometer with a display
- Reads
- Temperature and relative humidity
- History
- Records high and low readings between resets
- Placement
- Free-standing, wall-mountable or magnetic
- Power
- Battery
- Connected
- No — readings are on the device only
Specifications are taken from the manufacturer. Variants and revisions differ — check the listing before ordering.
Suitability
Is it right for you?
A good fit if…
Finding out what your bedroom actually does overnight before spending on any fix.
Look elsewhere if…
You already know your numbers and need to act on them rather than measure again.
Key Features
Min and max memory
The 4am reading, recorded
You are asleep when the room does its worst. The high-low record is what turns a guess about your bedroom into a fact.
Temperature and humidity
The pair that decides comfort
Dry air produces the sore throat people blame on illness, and warm air blocks the core-temperature drop sleep depends on. You need both numbers.
Cheap enough to be first
Measure before you buy
Nearly every fix on this site is worth less than knowing whether you need it. This is the least expensive way to find out.
Nothing to configure
Battery in, reading out
No app, no pairing, no account. Put it at mattress height near where you sleep and read it in the morning.
Frequently asked questions
What temperature should my bedroom be?
Between 60°F and 67°F, or 15.5°C to 19.5°C. That is the range sleep laboratories use, and it is several degrees cooler than most people set a thermostat. Measure before you adjust — rooms rarely sit where the thermostat claims.
What humidity should a bedroom be?
Between 40% and 60%. Below that and you wake with a dry throat and blocked nose; above it and you invite dust mites and mould. Both ends of that range are common and neither is obvious without measuring.
Why does the overnight high and low matter?
Because you are asleep for the readings that count. A room at 19°C at bedtime can be well above that by 3am with the door shut and two people in it. The min/max record is the whole reason to own one of these rather than glance at a thermostat.
Do I need a connected version instead?
Only if you want to chart changes over a week or two. A basic display answers "is my room in the right range". A logging model answers "what did changing the thermostat actually do", which is a different and more expensive question.
Educational Disclaimer: SleepOriginal provides general educational information and practical self-guided resources. It is not medical advice, diagnosis, or treatment. People with persistent or concerning sleep difficulties should speak with an appropriately qualified healthcare professional.
Think it's a fit?
Availability and pricing sit with Amazon and change without notice. The link below opens the current listing so you can see today's details for yourself.
Check Price on AmazonAffiliate disclosure. SleepOriginal participates in the Amazon Associates Programme. If you buy through this link we may earn a commission at no additional cost to you. It never changes what we recommend or what we say about it. Read our policy.
You might also like
Best breathable sheets for hot sleepers
Best for multiple fan and noise choices
Join the conversation
Questions and experiences are welcome. Every comment is read by a person before it appears, and your email address is never published.
No comments yet — yours would be the first.