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KILL A WATT · Kill A Watt Connect P4498 Electricity Usage Monitor Power Consumption Meter with Two Piece Housing and 35 Inch Cord for Easy Use
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The Kill A Watt Connect P4498 is worth considering if you want to read volts, current, watts, frequency, power factor and VA at the socket, and you want the display away from the wall. The 35 inch cord is the headline feature, and the stored minimum and maximum let you catch a spike you did not watch for. But the listing publishes no accuracy figure, no maximum load rating, no resolution, and no statement of what the min and max memory actually stores. Buy it for convenience and relative comparison. Do not buy it if you need a documented load limit or a calibration certificate, because this page cannot tell you either.
The 35 Inch Cord Is the Whole Point, and It Changes How You Measure
Most plug-in monitors sit in the socket they are measuring. That is fine for a fridge in an open kitchen. It is awkward behind a washing machine, under a desk, or in a socket box where the display ends up facing the wall. The P4498 splits the device into two pieces joined by a 35 inch cord. The plug goes where the appliance plugs in. The display goes where you can read it.
That separation matters more than it sounds. A monitor you can see while you switch a load on and off is a monitor you will actually use to find what is drawing power. If the display is buried, you read it once and give up. The listing states the cord length but does not publish the cord gauge, the maximum current the cord is rated for, or whether the two pieces are permanently joined. Those are the questions an electrician would ask before putting the unit on a heavy load. Treat the cord as a convenience feature and keep heavy appliances off it until you know the rating.
For a general guide to what these meters do and where they stop, see how to choose a plug-in electricity usage monitor.
Volts, Current, Watts, Frequency, Power Factor, VA: What Each One Tells You
The listing says the display shows volts, current, watts, frequency, power factor and VA. Those are not six versions of the same number. They answer different questions.
- Volts is the supply voltage at the socket. If it sags when a load starts, you have a wiring or supply problem worth knowing about.
- Current is the amperes flowing. It is what heats cables and trips breakers.
- Watts is real power, the part that does work and that your meter bills.
- Frequency is the AC cycle rate. On mains power it should sit near the nominal figure; a wild reading suggests a bad connection or a failing supply.
- Power factor is the ratio of real power to apparent power. A motor or a power supply with a poor power factor draws more current than its wattage suggests.
- VA is apparent power, volts times amps. It is what the wiring and the inverter see, which is why off-grid users care about it.
Having all six on one screen is genuinely useful. What the listing does not publish is the resolution of each, the accuracy of each, or the range over which each is valid. A power factor reading is only meaningful if the meter can resolve small differences, and the listing is silent on that.
The Cost Projection Is Arithmetic, Not Measurement
The listing says you can see the cost of an appliance by hour, day, week, month and year. That sounds like the meter knows your tariff. It does not. You enter a rate, and the meter multiplies the measured watts by time and by that rate. The projection is only as good as the rate you typed and the assumption that the load stays constant.
That is fine for a fridge, a router, or a pump that runs a steady duty cycle. It is misleading for anything with a thermostat, a standby mode, or a variable speed drive, because the annual figure is extrapolated from whatever period the meter watched. The listing does not publish how the rate is entered, how many decimal places it accepts, or whether the projection resets. Read the annual figure as a rough scaling of the measured period, not a prediction.
If you want to work out what a steady load costs from first principles, how much electricity a 100 watt device uses walks through the arithmetic.
Minimum and Maximum Memory: Useful, Undocumented
The listing states that the meter stores minimum and maximum readings in memory. That is the feature that turns a glance-at-the-screen meter into a diagnostic tool. You can leave it connected to a fridge for a day and come back to the highest wattage the compressor drew and the lowest the unit settled to. The difference between those two numbers tells you how hard the appliance works and whether it is short cycling.
What the listing does not say is which quantities are stored. Minimum and maximum watts is the obvious reading, but volts, current, and VA also have minimums and maximums worth knowing. Nor does it say whether the memory holds a single min and max since reset, or a rolling record, or whether it survives a power cut. The word memory implies retention, but the listing does not define it. Assume it holds one min and one max per displayed quantity until reset, and verify by resetting and watching, because that is the only way to know.
The Accuracy Claim and the Load Rating the Listing Leaves Out
The listing says the meter is accurate and easy to use. Accurate is not a specification. A buyer needs a figure and a condition: plus or minus some percent of reading, over some range, at some power factor. The listing publishes none of that. It also publishes no maximum current or wattage, no resolution for any quantity, and no statement of whether the accuracy holds at low power factors.
This matters because plug-in monitors are often used to check whether an appliance is drawing what its label claims. If the meter itself is off by a few percent, you cannot tell a failing appliance from a healthy one at the margin. The honest position is that the P4498 gives you a repeatable relative reading. It is good for comparing one appliance against another, or the same appliance before and after a change. It is not a substitute for a calibrated power quality analyzer, and the listing does not claim it is.
On load rating, the silence is a safety issue. A plug-in monitor carries the full appliance current through its internals. Without a published maximum, you should not put a space heater, a welder, or a large air conditioner through it. Keep it to ordinary domestic loads and check the unit’s own label when it arrives. For work at the distribution board, a clamp meter such as the ones in how to choose a clamp meter for HVAC is the right tool.
Where the P4498 Fits, and Where It Stops Being the Right Instrument
The P4498 is the right instrument for a homeowner or a technician who wants to know what a single plug-in appliance draws, what it costs to run, and how its consumption varies over a day. The cord makes it practical in tight spots. The min and max memory makes it a diagnostic aid rather than a novelty.
It is the wrong instrument for three jobs. First, whole-home consumption: a plug-in monitor sees one socket, and a whole-home view needs a different device, as covered in how to choose a whole-home energy monitor. Second, power quality investigation: harmonics, transients and three-phase recording are outside what the listing describes, and the ETCR 8430 class of instrument exists for that. Third, any measurement where a documented accuracy figure is required, because the listing does not provide one.
If you already know you want the plug-in format and you are comparing models, the Kill A Watt P4400 review covers the simpler sibling. The P4498’s case rests on the cord and the memory, not on published precision.
Should You Buy the Kill A Watt Connect P4498?
Buy it if the 35 inch cord solves a real placement problem for you, and if you want volts, current, watts, frequency, power factor and VA on one display with min and max memory. Do not buy it expecting a published accuracy figure, a documented maximum load, or a defined memory behaviour. The listing does not provide them, and no amount of reading between the lines will. For relative comparison of ordinary plug-in appliances, it is a sensible choice. For anything that needs a number you can defend, look for an instrument that publishes its specifications.
Recommended Tools
Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.
Frequently Asked Questions
Does the listing state the maximum wattage or current the P4498 can handle?
No. The listing does not publish a maximum load rating. That is the most important missing figure for safety. Keep it to ordinary domestic appliances until you can read the rating on the unit itself.
How accurate is the P4498?
The listing says accurate but publishes no percentage, no range and no conditions. Treat readings as good for relative comparison, not as a calibrated measurement.
What exactly do the minimum and maximum memory store?
The listing does not say which quantities are stored, whether the memory is per quantity, or whether it survives a power cut. It states only that minimum and maximum readings are stored.
Can I use it to work out my annual running cost?
You can enter a rate and the meter will project by hour, day, week, month and year. The projection assumes the load pattern you measured continues. The listing does not publish how the rate is entered or how many decimal places it accepts.
Does the 35 inch cord mean I can use it on a heavy appliance?
No. The cord length is a placement feature, not a rating. The listing publishes no cord gauge and no current rating, so heavy loads should stay off it until you have the unit's own label.
Is this the same as the Kill A Watt P4400?
They are related plug-in monitors, but the P4498 adds the two-piece housing and 35 inch cord. The listing for the P4498 does not publish a comparison with the P4400, so check the sibling review for that model's stated features.
Affiliate disclosure: Akermin earns a commission from qualifying Amazon purchases made through links on this page. Our editorial picks are based on documented specifications and owner feedback, not commissions.
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