Table 1 of BS EN 61008-1 specifies max 150 ms for 2x residual current rating for non-delay RCDs [or 60 ms (min) to 200 ms (max) for Delay 'S' type RCDs] - useful for fault-finding, or if you want to check operating time < 0.2 s for TT systems under certain circumstances (although BS 7671 has never verbosely required this test, and wording revised in BS 7671:2018+A2:2022 no longer leads people to conclude this test is necessary). The operating times for 2x residual current relating information also used to be in Table 3A3 of BS 7671:2018, which was removed in BS 7671:2018+A2:2022.

Do you have to press the test button every time you do a zs test or will it do it automatically?

The MFT1730 has Bluetooth and a 1000 test results storage...

Crazy price 😮

It can do GFCI test, USA system?

Sorry, I think the thing looks like a Fisher-Price kid's toy. It's way too expensive and I don't like colour touch screens, they're a gimmick and battery drainers. Also I detest software I have to pay a subscription to use, I want something that runs on my computer and doesn't have to communicate with "the cloud" whatever that is to work. I'll stick with the 1741 thanks all the same, even my good old 1552 still does what it says on the tin.

What are those clowns with feet one the table sponsoring biscuits.