New DMM - BM235 or BM257 for Heating engineer?

[coppertree]

Hi Folks,

I have managed with a fairly basic DMM for a number of years, it's starting to act oddly and thought it about time to invest in something half decent.
mainly to help with occasional diagnostics on gas boilers. so
basic safety checks
resistance readings on NTC thermistors
flame rectification
sometimes DC voltage to gas valves and fans etc
after some researching it seems the BM235 or BM257 looks a solid reliable robust day to day meter in the field?
would you agree? and for my purposes would the 235 be adequate - any advantage getting the 257?
i have found them on telonic.co.uk - about £76.00 for 235  - £90.00 for 257
So not much difference in price and for me would be a business expence

Always good to have the opinion of people with knowledge - every day's a school day!

Thanks in advance for any advice

[2N3055]

235 has VFD mode (frequency converter mode filter) but 257 has such frequency response  so it doesn't need one...
257 is slightly more accurate and has bar-graph ...

Otherwise, they are very similar, both good instruments, both more than enough for stated purpose... They both should be way more than half decent, they are pro level kit.
Regards