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The Lab Notes

Spec-sheet comparisons and buying guides for home and tech products, each with its sources and the date it was last checked.

Home AppliancesOct 25, 2026

What Ceiling Fan CFM and Airflow Efficiency Mean

Ceiling fan listings print an airflow figure and an efficiency figure, and the two will not divide into each other. The federal test method explains why, and shows which speed is missing from the page.

AudioOct 24, 2026

What Amplifier and Soundbar Watt Claims Mean

One AV receiver is sold as a 75W model in one country and a 140W model in another, and its own spec table lists three different wattages. A federal rule explains which figure counts.

Home AppliancesOct 23, 2026

What Dehumidifier Pint Ratings Actually Mean

A pint rating is a 24-hour figure measured at one temperature, and the federal test changed that temperature. Here is how to read the number, and the larger second number sitting next to it.

Home AppliancesOct 22, 2026

What Appliance Warranty Pages Leave Out

The number of years is the figure makers advertise. Whether those years cover labour, and which failures the page refuses, decide whether a repair costs nothing or several hundred dollars. Read on real warranty documents from Alliance Laundry Systems, GE Appliances and LG, checked October 2026.

SoftwareOct 22, 2026

MeDo Review: What a Working App Actually Costs in Credits

MeDo publishes what most AI app builders hide: a per-action credit price list. A default build message costs 40 credits, publishing costs 20, and a source download costs 300. This review converts those credits into dollars from MeDo’s own documentation, checked October 22, 2026, and names what the vendor leaves unpublished.

TechOct 21, 2026

What IP Ratings and Water Resistance Cover

Apple rates one watch at 100 metres of water resistance and then states it should not be used below 40 metres. The gap is not a contradiction; it is the difference between a pressure test and a permission. This guide reads the IP code against IEC's own scope statement and Apple's published footnotes, checked October 15, 2026.

TechOct 20, 2026

What SSD Endurance Ratings Actually Promise

Two numbers end an SSD warranty and the first one to arrive wins: a year count and a write budget printed as TBW. This guide reads the endurance rows on the Samsung 990 PRO, the WD_BLACK SN850X and the Solidigm D7-PS1010 against the JEDEC standard that defines how such ratings are produced, checked October 15, 2026.

Floor CareOct 19, 2026

Robot Vacuum Suction Claims, Decoded

iRobot publishes suction as a multiple of an older Roomba. Roborock publishes it in pascals. Neither page publishes a run time, a dustbin capacity or a warranty term. Here is how to read what is there, from five product pages checked October 2026.

Power and BackupOct 18, 2026

Portable Power Station Numbers That Matter

Watt-hours and output watts are two separate limits, and a power station listing usually leads with whichever one flatters it. Here is how to read capacity, surge, cycle life and recharge claims on the EcoFlow DELTA 3 Plus, Anker SOLIX C1000 and Jackery Explorer 1000 v2 pages.

TechOct 17, 2026

What microSD Speed Class Labels Guarantee

The little symbols on a microSD card are the only figures on the package that promise a floor rather than a ceiling. The SD Association defines four separate class families, and a card's headline megabyte figure belongs to none of them. This guide reads both, using the SD Association standards pages and the SanDisk Extreme PRO microSDXC disclosures, checked October 15, 2026.

TechOct 16, 2026

Why Laptop Battery Hour Claims Disagree

Lenovo publishes three battery life figures for the same 57Wh ThinkPad: 17.11 hours, 15.5 hours and 30.6 hours. Nothing about the machine changes between them, only the test and the screen brightness. This guide reads the battery rows on Apple's and Lenovo's own specification pages, checked October 15, 2026.

Home AppliancesOct 15, 2026

SACC vs ASHRAE BTU on a Portable AC Spec Sheet

A portable air conditioner carries two cooling ratings and only the smaller one sizes a room. Here is how the federal SACC test gets to that number, and what LG, Whynter and Midea publish beside it.

DisplaysOct 14, 2026

Monitor Specs That Change What You Actually See

Four rows on a monitor spec sheet change what you see. Response time, the figure printed largest, is the least comparable number on the page. Here is how to read both, using the Dell 24 Plus S2425H, the LG UltraGear 27GS95QE-B and VESA's published certification criteria, checked October 2026.

TechOct 13, 2026

How to Read Printer Page Yield and Cost Per Page

A cartridge yield is a figure from a standardised test, and it only becomes useful once you divide the cartridge price by it. Here is that arithmetic on current Brother and Epson pages.

Home OfficeOct 12, 2026

How to Read a Standing Desk Spec Sheet Before You Buy

Five numbers decide whether an electric standing desk fits its user, and most listings print only two of them. Here is how to read height range, capacity, speed, noise and warranty on real spec sheets from UPLIFT and Vari, checked October 2026, and what to do when a maker leaves one out.

AudioOct 12, 2026

How to Read a Wireless Headphone Spec Sheet

Noise-cancelling headphone listings print a battery number and a price and little else that can be compared. Here is how to read battery conditions, quick-charge claims, codec lists, Bluetooth version, weight and warranty on real product pages from Bose and Sennheiser, checked October 2026.

Home AppliancesOct 11, 2026

How to Read an Air Purifier Spec Sheet: CADR, ACH, Filters

Three numbers decide whether an air purifier fits a room, and most listings bury them under a coverage claim. Here is how to read CADR, air changes per hour and filter cost on real product pages from Coway, Levoit and Blueair, checked October 2026.

Home FragranceOct 9, 2026

How to Read a Scent Diffuser Spec Sheet Before You Buy

Four numbers decide whether a cold-air diffuser suits your room. Here is how to read them on real product pages, and what to do when the maker leaves one out.