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Cells show only what the supplied listing bullets state. Where a listing is silent, the cell reads Not stated. The Temtop PMD331 (7-channel, RS485) and the Temtop PMD331 (USB, 4-inch screen) describe the same PMD331 platform, so their table rows are near-identical by design.

Cells show only what the manufacturer listing publishes. Where a figure is absent the cell reads Not stated. Cable lengths are as stated and are not a guarantee of usable reach inside a flue with offsets.

Cells show only what the manufacturer listing publishes. A 40 kHz sensor centre is not the same as a 20 kHz to 90 kHz coverage range; the first describes the sensor, the second describes the band the receiver can be tuned across.

Sensitivity figures are quoted exactly as the listings publish them and are not directly comparable across sensor types. A detector that does not name R290 or R600a in its listing should not be relied on for those gases without written confirmation from the seller.

Cells marked Not stated are absent from the listing bullets. The TOPTES CT-580 response claim of 0.3 seconds is not shown here because it is a response claim rather than a range or resolution figure, and it is discussed in the review.

Cells marked Not stated are absent from the supplied listing text. Cylinder blends are not interchangeable between instrument families; confirm the blend and the regulator flow rate against the detector manual before ordering.

Cells marked Not stated are absent from the manufacturer listing. The Klein Tools CL120 clamp measures AC current only; it does not read DC current. The Blue Sea Systems 8248 standard unit operates in the negative side of the circuit only.

Cells marked Not stated reflect the absence of that specification in the supplied listing bullets. They are not estimates. The Vanlison Non Contact Three Phase Rotation is a phase rotation tester rather than a clamp meter and is included because phase sequence is a three phase measurement task.

Cells show only what the manufacturer listing publishes. Where a listing is silent the cell reads Not stated rather than an estimate. The Klein Tools CL445 HVAC Clamp Meter is included on the strength of its stated inrush function even though the listing does not publish the capture window or the maximum current.

Cells marked Not stated mean the manufacturer listing does not publish that figure. They are not estimates. The ETCR5000 with ETCR300F Current Clamps and the ETCR5000 with ETCR040B Current Clamps are the same analyzer with different supplied clamps.

Cells read 'Not stated' where the manufacturer listing does not publish the figure. Resolution figures are not accuracy figures and are not shown in the accuracy column.

Cells show only what the manufacturer listing publishes. Where a listing is silent, the cell reads Not stated. No figures have been estimated or converted.

Stem length is the specification that decides which job a thermometer can do. A probe shorter than the depth you care about reads the surface layer, not the core. All seven are analog instruments with no batteries; none of the listings publishes an accuracy figure, so treat readings as working indications rather than calibrated measurements.

Cells show only what the listings publish. Where a listing is silent, the cell says Not stated. Resolution is not accuracy; no accuracy tolerance is published for any moisture channel on this page except where noted.

Cells marked Not stated are absent from the supplied listing text. Wind direction is listed as measured on units that publish direction data but do not give a numeric range. No accuracy figures were published for any of these products.

Cells are drawn only from the supplied listing text. Where a listing does not publish a figure the cell reads Not stated. The BTMETER BT-100WM Handheld Anemometer and the HoldPeak 866B-WM Handheld Weather Meter are functionally similar handheld meters; the HoldPeak 866B-WM Handheld Weather Meter is listed here because it publishes the pressure logging and altitude correction detail.

Cells marked Not stated are absent from the manufacturer listing. No figures have been estimated or converted.

Cells are drawn only from the supplied listing text. Where a specification is not published, the cell says so rather than estimating. Only the Ambient Weather WS-2902, the WeatherFlow Tempest and the Ambient Weather WS-2000 publish the full sensor set needed for spray windows and evapotranspiration estimates.

Accuracy claims are reproduced as the manufacturer states them. None of the listings publish a reference method, test conditions or sample size, so the percentages cannot be compared against each other.

Cells show only what the manufacturer listing states. Where a listing is silent, the cell reads Not stated. The CCA and Ah figures are the tester's rated measurement range, not the capacity of the battery you own.