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Digital Thermometer with Hygrometer - TM-871

4.1 out of 5 stars 7 customer reviews

Currently unavailable.
We don't know when or if this item will be back in stock.
Currently unavailable. We don't know when or if this item will be back in stock.

Product details

  • Boxed-product Weight: 100 g
  • Delivery Destinations: Visit the Delivery Destinations Help page to see where this item can be delivered.
    Find out more about our Delivery Rates and Returns Policy
  • Item model number: TM-871
  • ASIN: B003MAB00E
  • Date first available at Amazon.co.uk: 26 May 2011
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (7 customer reviews)
  • Amazon Bestsellers Rank: 163,592 in Electronics (See Top 100 in Electronics)

Customer Reviews

4.1 out of 5 stars
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Top Customer Reviews

Verified Purchase
I bought this for its hygrometer part rather than its thermometer, & bought this model rather than the many others available because this was the only one (that I found anyway) that gave any indication of its accuracy (stated as within 3% Relative Humidity - to put this in perspective, ideal RH is 40% to 50% RH).
The hygrometer's MIN & MAX facility is very useful for measuring RH while I'm elsewhere or asleep - & this facility is also very easy to operate, with successive presses of the MIN-MAX button displaying max,min,current of both RH & temperature - & of course the RESET button does exactly what it says (removes previous readings, leaving in place the current readings of RH & temperature).
(I've not yet used the external temperature probe, except to check the internal thermometer! - readings agree, differing occasionally by up to 0.3 degrees).
ACCESSING BATTERY:
The extremely brief instructions omit how to access the battery compartment, which took us a while to figure out! - at the base of the back is a very small recess, insert fingernail & prise open carefully & this is the unit's stand (only opens 2cm) - opening this reveals a small triangle, press this while pulling towards the base to open the battery compartment - when new, there's already a battery in, just pull out the plastic strip that's stopping it being fully connected. Unfortunately replacing the battery cover is slightly tricky, as the outdoor-probe's wire has to be carefully kept out of the way while the battery cover's replaced (slight design flaw there!).

I needed to check the RH in various rooms, because high RH promotes woodworm & moulds. (Moulds are not only musty-smelling but also serve as food for dustmites, & mould spores can trigger asthma & [would you believe it:] depression ...
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Verified Purchase
The outdoors temp sensor seems to respond to temp reasonably quickly. Both the indoor temp and hygrometer readings need a little time to settle. If using between different rooms/locations I would suggest a period of at least 5 minutes before a measurement is made.

The outdoor temp sensor can not be unplugged.

The two seperate temperature indications offer a form of cross-checking suspect readings assuming they have different circuits.

The unit is very light and has a really cheap feel about it. This I assume is reflected in the fairly cheap purchase price of the unit.

Overall I am happy with it but the cheap feel and permanently connected external sensor makes it lose a couple of stars.
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Verified Purchase
I have a wide array of thermometers and hygrometers to monitor my woodworking workshop rooms; i bought one of these to give it a try, and it ranks among the most accurate i have. Might be a coincidence, that i got a good sample, but at least in my case, it was more than worth it's (low) price.
Even the probe for the outside seems accurate. It also came with the battery.
I can't complain and would recommend it; might even get a couple more and see if they are as good as the one i got.
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Bought two of these units to monitor both sides of the room they are in. also the top and the bottom on each side useing the probes.
works a treat.
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