How to determine square numbers (eg apartment size) this meter is recommended without restrictions. One does not have to "crawl" with the tape measure on the floor. (Or similar edgings kitchen) for shorter ranges and highly accurate measurement results, I came to the conclusion that the re-measurement of "ruler" safe variant. Very easy handling (manual in German is enclosed). For the purpose for which I purchased this device and for this price, a very empehlenswerte acquisition.