Kane sent me an EEVblog branded 555 meter, a variation on the 121GW, and they wanted to know if I was keen to sell it.
But I didn't understand why they added motor measurement on such an instrument, didn't make much sense
Multimeter OEM's and product line managers have little to no experience in the environments they are targeting. So there are features of no real use that Company A came up with and everybody just copies it, adds it in I think.
I've worked with VFD's to 100HP on 480VAC so DC bus is around 850VDC. Connecting a multimeter to that (motor output) being commutated at 6-12kHz PWM carrier freq. is a mind blowing amount of common-mode noise that will cause either erroneous readings, crashing etc. which requires added EMI shielding and added cost and bulk.
It's an 850Vpp square-wave and a multimeter will tell you nothing of value doing that risky measurement. It can't help you troubleshoot a VFD or motor.
In plant environments there is always moisture, dirt, CNC coolant glycol, coal dust etc. so you need two things - Low Z for voltage measurements and Ohms test current higher than a flea fart. Brymen's designs have dropped down to around 0.3mA which is no good in these environments. It should be at least the usual 1mA or higher i.e. testing a 1,200V 150A IGBT on Ohms to see if it is damaged, you can get misleading readings.
It's missing LowZ on V so kinda crappy for electrician's use. Would not buy a multimeter without LowZ V in a plant or industrial environment, been there done that.
FWIW: The 2807 model has "Single-pole Contact EF-Detection for Precise Indications of Live Conductors"
This is non-contacting electric-field detection, which is different from Low Z voltage measurements.