I use to work another laser distance meter of the company Bo ... blue green I had already in the test are all broadly OK and do their job more or less. Kaleas I did not know as a company for metrology thus you can as a customer make a lot wrong in the end you can still return if not satisfied. I can take the unit now for a few days in test mode and in 2 m area against three different yardsticks, the result is a tolerance range of +1 to 2 mm which is sufficient for me absolute in carpentry is that tolerance in the standard in metal that should also be OK. My decision to buy the LDM 500 are many amusing Super Easy to use exactly what you need so many not so often but the device can. The size and weight with the two small AAA batteries Super Handy and with rubber coating easily. The highlight the T6 button 2 sec. Press and a 5 sec. Measurement countdown starts this function is the guarantor against the blurred while measure, this feature I never want to miss again. The kickstand is not designed for the fitting of the device as I have read in a recession but is a flip-out end angle Ingenious construction I need often. The display has a backlight that can be switched on separately but also as an excellent workmanship and read very good quality and above all stable. For me all 5 stars are fully met a professional unit at a bargain price here can be nothing wrong.