How to read nail equipment specs

Short answer

Almost every number on a nail equipment listing is a maker claim: RPM, torque, battery hours, watts, wavelength, "HEPA". They are useful for checking fit and for comparing models from the same maker, but they are not independent measurements, and makers rarely say how they got them. When the few independent studies measured real nail lamps, they found each device had its own spectrum,^[1] and that price did not predict UV output.^[2]

Four questions to ask of any spec

1. Who says so? The maker, a distributor, a marketplace seller or an independent lab.
2. Measured how? A figure with no method, load or distance is hard to compare.
3. Does it agree with the maker's other pages? Conflicts are common.
4. Does it answer your question? A motor speed does not tell you about dust capture; a wattage does not tell you about light at the nail.

E-files: RPM, torque and battery hours

• RPM is a no-load maker figure. KUPA lists its KP-55 handpiece at 30,000 RPM;^[3] that is the maker's number, not a speed measured under load on a nail. See nail drill RPM and torque.
• Torque without a method cannot be compared. Medicool lists 4.8 N-cm for its Pro Power 35K Portable,^[4] but does not say how it measured that, so we do not compare it with other brands' torque figures.
• Battery hours are claims. KUPA claims 10-12 hours and a 2-hour full charge for the Passport NEXT, with no test method given.^[5] Medicool claims up to 20 hours on the Pro Power 35K Portable's product page,^[4] while its own 2025 e-file guide lists a different figure for the same model.^[6] When one maker gives two numbers, plan around the lower one.

Lamps: watts, wavelength and labels

• Watts and wavelength are maker figures, not measured output. See nail lamp wattage and wavelength.
• Labels can be wrong. In a 2018 study of 28 nail dryers in Spanish beauty centers, 85% had a visible label, but 23% of those labels contained errors under the EN 60335-1 guideline.^[1] That was a labeling-guideline check, not a finding that wavelengths were misstated.
• Pages contradict themselves. SUNUV's SUN2C page gives timer presets of 10/30/60 s plus a 90 s low-heat mode in one place and "10 / 30 / 60 / 99s" in its spec table.^[7] SUNUV's SUN9C page also has conflicting timers,^[8] and its listed dimensions are nearly the same as the much heavier SUN2C's, which looks like a template error, so we do not publish them.
• Price is not a proxy. The 2021 Australian study of eight home devices found price did not indicate lower UV output or a safer operating temperature.^[2]

Dust collectors: motor RPM, airflow and "HEPA"

• Motor RPM is not airflow. Kiara Sky claims a 120,000 RPM brushless motor for its Beyond Pro collector,^[9] which describes the motor, not how much air or dust the unit moves.
• "HEPA certified" needs a standard. Kiara Sky calls its inner filter HEPA certified without identifying a standard or test.^[9]
• Implausible numbers are a warning. A US distributor lists the 24 W SHEMAX PetitePro X at about 200 CFM of airflow,^[10] which is unusually high for that power, and we could not verify it.

See nail dust collector specs explained for what each collector figure means.

How this site handles specs

We do not test products. Every number on this site is attributed to the maker, a distributor or a named study, and where a maker's pages disagree we say so instead of picking one. Google describes its reviews system as aiming to reward reviews with "insightful analysis and original research" written by experts or enthusiasts;^[11] we aim for that by explaining what a number can and cannot show, never by passing off a maker's number as our own.

Next

• Nail drill RPM and torque: what 30K and 35K do and don't tell you
• Nail lamp wattage and wavelength
• Nail dust collector specs explained
• All buying and safety guides