Find similar products here

Indoor / Outdoor Hygro Thermometer

Price match guranteePrice match guarantee

We can price match this item if found elsewhere. Call us on:

0333 400 9500

Quoting product code: L55AJ


Our delivery options

Free standard delivery (orders over £10)
3-5 working days 9am-5pm
Standard delivery (orders under £10)
3-5 working days 9am-5pm
Next day delivery
Mon - Fri, order by 6pm
From £5.99
Specific day/time delivery
Choose am / pm OR before 9am / 10.30am
From £5.99

Specific options for this product are available in the checkout. Read more delivery information

About this product


  • Indoor and outdoor temperature (°C/°F)
  • Min / Max temperature and humidity memory
  • 12/24 hour alarm clock with snooze function

Product overview

• Indoor and outdoor temperature (°C/°F)
• Min / Max temperature and humidity memory
• 12/24 hour alarm clock with snooze function
• Audible ice point alert
• Wired 3m external probe

Rated 4 out of 5 by from Humidity monitor - Very good This week I bought both this Humidity / Temperature monitor as well as item N18FR. Whereas N18FR is proving difficult to open the screw so a battery can be installed this £20 monitor was ready to work including batteries as soon as it arrived. I make cheese at home and have a cheese cave and some hard cheeses need a humidity range which will be easier now I have an electronic hygrometer. I have used this one in both fridge and cheese cave and it works very well especially as it has 3 metres of cable to a small probe. The other monitor is more for spot checks and in plastic boxes used for cheese ripening eg Brie or meat curing
Date published: 2015-05-23
Rated 4 out of 5 by from Not too dear, big display visible from a distance. Great for a bedroom. Hygrometer quite handy to observe when you need fresh air in winter. Detachable external probe means you can leave it dangling outside when checking things elsewhere (in kitchen or bathroom in my case). A variety of functions through buttons at the back.
Date published: 2014-11-18
Rated 4 out of 5 by from Contrary to what is said the unit does memorize min/max humidity - since last reset or 0:00 hours (optional auto-reset - great!)
Date published: 2014-11-18
Rated 4 out of 5 by from Impressive Good value for money, easy to set up and read. Very responsive to temperature and humidity fluctuations.
Date published: 2015-07-02
Rated 1 out of 5 by from Disappointingly unreliable product Bought this for our caravan as surprisingly few similar products on the market. However, the external temperatuere only works about 10% of the time so not fit for purpose as frustratingly faulty. Sadly no other similar product options at Maplins.
Date published: 2017-12-29
Rated 3 out of 5 by from thermometer L55aj works well - BUT it only gives one type of reading at once - the readout must be toggled with the righthand cursor - which is not a good idea if placed out of reach. The time readout being unnecessary.
Date published: 2017-03-20
Rated 5 out of 5 by from Value for money unit easy to set up and use and clear display. early days yet for reliability but no premature electronics failure so should be OK
Date published: 2017-04-15
Rated 5 out of 5 by from Good value for money I bought this for a present and have had good reports from her! Very pleased with it.
Date published: 2018-01-03
  • y_2018, m_2, d_21, h_1
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.7
  • cp_1, bvpage1
  • co_hasreviews, tv_1, tr_8
  • loc_en_GB, sid_L55AJ, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_maplin-en_gb


Indoor Temperature Range: 0 to +50°C (+32 to 122°F)
Outdoor Temperature Range: -50 to +70°C (-58 to 158°F)
Temperature Accuracy: ±1°C (±2°F)
Temperature Resolution: ±0.1 °C / °F
Humidity Range: 20% to 99% RH
Humidity Accuracy: ±3% RH
Humidity Resolution: 1%
Sample Rate: 10 seconds
Alarm Duration: 12 minutes
Battery Requirement: 1 x AAA battery (included)
Sensor Cord Length: 3m (10 feet)
Display Dimensions: 79 (w) x 66mm (h)
Dimensions: 98 (w) x 110 (h) x 21mm (d)

can i buy a replacement wire ?

Asked by: Cjames
On this occasion, Maplin does not stock a product that exactly meets your requirements, or indeed anything close enough to offer you as an alternative.
Answered by: Dominic
Date published: 2017-10-11

What if any IP Rating is this?

Asked by: Carl1987
This is not IP rated.
Answered by: Dale
Date published: 2017-09-29

does wire flat or round

Asked by: el2548
This is battery operated.
Answered by: Darren
Date published: 2016-10-04

I have one of your hydro thermometers but no instructions about setting the time. Please tell me how to do this

Asked by: Robert
The full instruction manual can be found in the link below.
Answered by: Darren
Date published: 2017-11-05

Please advise as not clear from your web, can it be hung up rather that stood? Thank you.

Asked by: AldaScouse
I've just brought this item and it can be hung, just put my one up on the wall.
Answered by: Wilkie
Date published: 2016-06-14

I want to measure the internal humidity in a damp room. Is this product suitable for that?

Asked by: Timbo
This should work fine for your intended use.
Answered by: Gareth
Date published: 2017-01-27

Can you set the alarm for maximum/minimum temperatures?

Asked by: Hatter
No this is just for the clock part.
Answered by: Dominic
Date published: 2016-05-11

Is it possible to order replacement sensors for this item? 

Asked by: Rustyreptile
Unfortunately we do not stock order replacement sensors for this item.
Answered by: Billy
Date published: 2016-04-30
  • y_2018, m_2, d_21, h_1CST
  • bvseo_bulk, prod_bvqa, vn_bulk_2.0.7
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_22
  • loc_en_GB, sid_L55AJ, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_maplin-en_gb