Used a few stuffs…
Ipad 3 with Behri UCA202, & also IS202 dock recording into Hokusai. both worked but bulky & downvoted the flakey camera kit & cabling. Also my Ipad was short on storage GB for longer recordings.
Zoom H4n… better but still too big and didnt like that line level stuff had to go through the Preamp. Handling noise while field recording wasn’t great. Poor battery life.
Last 18 months: Roland R-05… cheapish, takes standard sd, same size as compact camera, batteries go for ages, line level input & pretty good limiter… Built in mics been happy with, records for as long as your card memory & can split files into 2gb segments automatically. Would have bought the Sony PCM M10 if I wanted to fork more $ & was using mic more than line input…, but the R05 has its advantages too & fits the OP parameters.