Thermometers Direct

Aquarium / Fridge Max Min Thermometer With a Alarm ETI 810-920

(Inc. 20% VAT)
(£11.00 Exc. VAT)
(5 Reviews)
26 in stock, immediate despatch
Product Code
Part Number
ETI Thermometers

Aquarium / Fridge Max Min Thermometer With a Alarm

Is ideal for use both domestically and in places of work, with a single cable sensor which allows the temperature of your fridge, freezer, bath, spa facilities or even a fish tank to be accurately measured whilst the display remains outside.

With an extra large display which can show temperatures in both C and F, an alarm which will sound if High / Low temperatures are exceeded, and the ability to show a wide range from -50C to 70C.

This thermometer although mainly designed for Aquariums or for monitoring fridge & freezer temperatures, is ideal for bath temperature, spa facilities such as saunas and steam rooms, swimming pools and fish tanks.

The remote probe can be mounted onto the aquarium wall using the suction pad supplied


  • Display in ºC and ºF
  • Shows Max / Min Temperature
  • High Low Temperature Alarm setting (out cable only)

  • Range: -50 ºC to 70 ºC
  • Display Accuracy: ± 1 ºC
  • Display Resolution: 0.1 ºC
  • Product Size: 50(L)*82(W)*16(D)mm
  • Cable length: 1 meter
  • Replaceable Battery
  • Has a stand on the back of the unit also a

The alarm sounds for 5 seconds every 60 seconds but it is not loud  

The Thermometer is designed to stay on all the time, therefore there is no off button for the unit
Customer Reviews (5)
Write a Review and share your opinions!
5 Reviews:

Used for brewing
01 August 2016  | 


I did not intend to put the thermometer to the use in which it was intended, instead I was going to use it in my brewing process. It wasn't until I received the instrument that I realised my mistake that the probe had a plastic cover which could leech unwanted particles into my beer.

So to use the device closer to what it was intended, you will understand I place my fermenting vessel inside another vessel, filled with water, ban-marie style, and control the temperature of the water with a fish tank heater.

Beer yeast is very fickle and to get the best out of it a constant temperature within the parameters for its style must be maintained. So according to my calculation this thermometer,s readings are absolutely spot on between 8 & 35' c which I guess is pretty much what the aquarium & brewing world want.

Downside it is monumentally slow to get to the correct temperature, however in the context of what I want it for, that is not an issue. Bit of a snip at 7.80 really.

Shipping was excellent.



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iIt does what it says
14 June 2016  | 

It measures temperature of liquid. It seems reasonably accurate. (closed) hand temperature was 33. Cup in the fridge was below 6

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x4 Aquarium/Fridge Thermometers
04 May 2016  | 

Too early to give a reliable review as only a recent purchase. The products themselves look sturdy and up for the job. Ease of ordering and quickness of delivery was excellent.

0 of 1 people found this review helpful.
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14 October 2014  | 

Very good service thank you

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01 July 2014  | 

Thermometers received promptly and in good order. Thanks

3 of 3 people found this review helpful.
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Delivery Costs

Shipping And Handling

1st Class post up to 14 days for delivery Long delays due to Covid-19

Carrier Service 1-14 days, is an estimated day of delivery is given when you place a order.

Delivery can be from 8.30am to 6pm

Please note all shipping is PER ORDER , NOT PER ITEM

Next day delivery is extra but we can not be held liable for the carriers delaying the (WEEKENDS AND BANK HOILIDAYS ARE NOT INCLUDED IN WORKING DAYS). Highlands and Islands / IV BT, IM TR 21-25, HS, KA27,28, KW1-3, 5-15, PA20-49, 62-77,61,78,PH17-26, 30-44, 49-50, ZE1-3 postcodes takes 48 hour

We must have the order by 3pm to have a chance of getting the order out the same day ( AS LONG AS GOODS ARE IN STOCK) Next day not available for European Orders

ORDERS OVER £65 POST FREE (Excluding European Orders)

For those orders over £65 we will send Post Free. To 1 address if more then 1 address per order, a delivery charge either £6.96 or £3.60 will be added
Once the parcels have left our premises the responsibility for delivery is with the Royal Mail or our Carrier.

We are not responsible for late delivery's that may of happened once the parcel has left us as we will try and get the parcel out to you as fast as we can. Please contact us if any problems, problems do happen but we are always here to help.
Or if you are still waiting for a parcel (over 10 working days Royal Mail) please let us know so we can sort out the problem.
Orders are dispatched by post / carrier to the name and address you have given to us. If we have received incorrect or inadequate information for the delivery of the goods we cannot accept any liability for late or failed delivery as a result of this.

Delivery Schedule We process your order right away. We will normally send your order to you in 2 - 5 business days . International orders are generally received in under 10 days.
Does not Include Trade Orders OR Purchase Orders

A calibrated thermometer if ordered in error / or not wanted can only be returned upto 14 days after purchase because the certificate has a expiry date

Purchase Orders

We accept Orders from Government based purchases, we regularly supply the following organisations

  • Hospitals, PCT's, NHS Foundation Trusts
  • Police Force, Fire Service
  • Councils
  • Prison Service
  • All British Military Forces

There is £50 minimum order value for purchase order

P&P on all Purchase Orders under £65 (ex Vat) £5.42+VAT
P&P will be free on Orders over £65 (ex vat)

Send your order by Email:-

Payment must be made within 30 days by BACS or Cheque