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Owl Cm119 Wireless Electricity Monitor

4.1 out of 5 stars 188 customer reviews
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2 new from £39.99 1 used from £34.99
  • Separate displays for current and historical cost of electricity
  • Current and historical CO2 emissions
  • Current and historical KWh
  • Multiple tariff settings
  • Time, date, temperature, alarm

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Product information

Technical Details
Part Number TSE003-101
Item Weight1.6 Kg
Product Dimensions23.4 x 20.4 x 5.2 cm
Item model numberTSE003-101
Item Package Quantity1
Weight1.6 Kilograms
  
Additional Information
ASINB001JJCLS0
Best Sellers Rank 98,717 in DIY & Tools (See top 100)
Shipping Weight662 g
Delivery Destinations:Visit the Delivery Destinations Help page to see where this item can be delivered.
Date First Available29 Oct. 2008
  
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Product description

Box Contains

  • Electricity monitor



  • Customer Questions & Answers

    Customer Reviews

    Top Customer Reviews

    This meter is great for giving you an overview of your current household usage. It's nice that you can keep the display somewhere central (like the kitchen) and take a look now and then.

    However, I kind of got the wrong impression from John Nance's review (21 Jun 2007). This meter isn't really suitable for measuring individual appliances. It's not sensitive enough to accurately measure many things. 60W devices register, but not accurately (e.g. switch one 60W light bulb on - the reading goes up by 30W; switch a second identical 60W light bulb on - the reading goes up by another 80W). Low power devices such as TVs, Hi-Fi's and radios don't register at all. If it's small appliances like these you're interested in measuring, consider one of the plug-in meters.
    Comment 135 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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    By Steve VINE VOICE on 4 Jan. 2009
    Verified Purchase
    I agree with everything Paul Ell (above) has written. Like Mr. Ell, I found that the two main cables (apart from the green/yellow earth) from my electricity meter were grey; according to the instruction leaflet one should be red, and the sensor attached to that. I attached the sensor to the right-hand cable, and it was correct. Incidentally it is a very tight fit, a snap-shut fitting which only just fitted the cable; I assume the designers intend this.

    In general, I think the booklet could be improved upon; it is in very small print and did not seem particularly easy to understand at first reading, although there is also a fold-out 'idiot's guide' included with the box. Also you MUST have a really small cross-headed screwdriver to hand (like a jeweller's) to get access to the battery compartments on both sender and receiver units. (Batteries are included thankfully).

    Having said all this, once up and running, I have found it invaluable. You can set the display for Cost, Energy (kW) or Greenhouse Gasses. There is a problem with the Cost function, as if like me you are on a tariff which decreases once past a certain kWh useage, the Owl cannot be set to automatically adjust, although it can be set to adjust to different tariffs at different times of day. So I have mainly used - as I suspect most people will - the Energy display. This shows how much energy is being consumed at any one time and is a real eye opener. I found that a 3 bar electric fire which had all the bars turned off was still using approximately 700 Watts! This turned out to be a convection heater which is built in and which I had, until now, assumed to consume negligible current.
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    5 Comments 97 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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    It has had exactly the effect that it promised: at a glance we can tell whether we have left lights, computers, or even a cooker ring on somewhere unnecessarily, and we go and turn them off. It is cutting our electricity use by at least 25%.What gets measured gets managed. And my husband is addicted: he has even been known to produce it when we have guests, no doubt boring them to death with his chatter about how much electricity we used to use!
    Comment 57 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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    Excellent and curiously engaging toy.

    It arrived the next day and was up and running within 5 minutes.

    Do not buy this toy - otherwise you'll find yourself running round the house turning everything on and off. My only topic of conversation now is the relative power consumption in standby of the toaster and PC.

    Setup was straightforward. You just clip the meter around your electricity cable, and tell the monitor to search for the meter. Was up and working in just a few minutes.

    The handheld monitor works all over the house so you can see exactly how much electricity you're using - and work out what's using it.

    In some ways it's not really necessary. We all know to turn off our TVs at night and that halogen lights are expensive to run. The difference is seeing the impact of every device. It really drives it home.

    In my case, it's going to save me £30 a month because I know the equipment that's driving up my electricity bill.

    Buy one!
    3 Comments 139 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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    Verified Purchase
    Despite reading in Watts and Watt-hours and claiming to measure power consumption and energy, this unit actually measures only V-A (Volt-amps). In fact it really only measures amps, which is all it can do without an actual connection to the mains, and then multiplies by the assumed voltage. This leads to HUGE ERRORS because certain appliances draw current out of phase with the voltage, giving rise to vastly inflated readings. The ratio of actual Watts to V-A for an appliance is given as the 'Power Factor', and for most fridges and freezers and other devices with induction motors it is around 0.3, so don't be surprised when your 50 watt fridge reads 160 watts. It gets worse: some electronic devices like induction hobs draw considerable capacitive current when they are switched OFF; probably because they incorporate large capacitors to filter the high-frequency noise they generate and stop it getting back into the mains. My two-hob induction unit reads around 100 Watts on the Owl even when turned off, though it is not actually consuming power, just pumping current in and out of the grid ninety degrees out of phase with the voltage! The true facts were revealed when I connected this and other devices through one of those little plug-in power monitors which do read true power as well as current and power-factor.

    The 'base-level' power in many homes is taken by fridge and freezer, plus a few things on standbye, and in my case reads around 350 Watts even though it's actually nearer 100 Watts - very misleading as this is a major contributor to total energy used because it is on all day! At higher readings, when cookers and kettles are used, the readings are fairly accurate, as such devices have a power-factor of one.
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    8 Comments 85 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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