Every comparison on KhatMaHai follows the same steps. This page explains how we choose models, how we score them and the limits of our method.
1. Only models you can really buy in Thailand
We start from models with a distributor or official shop in Thailand (Official Stores on Shopee or LazMall, retailers like HomePro, Power Buy and BNN, or the brand’s own site), because their warranty can be claimed at a local service centre. Grey imports may be cheaper, but they are usually harder to repair.
2. Numbers you can check
We give weight to measured values backed by a standard, such as an air purifier’s CADR, filter grades under EN 1822, suction in Pa, or the height a robot vacuum can climb. Our main source is the brand’s spec page. When sources disagree, we use the brand’s figure and add a note.
Claims like “kills 99.9% of germs” or “for rooms up to 100 m²” are checked for how they were tested first, because they are often calculated under conditions that do not match real use.
3. The full cost, not just the price tag
Filters, dust bags and electricity can make a cheap machine more expensive over time, so we include these costs when we can find them. All prices are the ones we saw on the date stated in the article and may change with promotions.
4. Independent tests when they exist
When independent organisations or media have tested a product, such as Chaladsue magazine, or when research has been published, we take it into account. We do not have our own test lab, so we never claim to have measured anything ourselves.
Where our scores come from
The scores out of 5 are our editors’ scores, not buyer reviews. We score on the main criteria for each type of product (such as performance for the price, long-term cost, safety and after-sales service in Thailand), and each article states the criteria it uses.
Keeping articles up to date
We review comparisons regularly, especially when new models arrive, prices change a lot or a recommended model is discontinued. The date at the top of each article is the last update.