I really feel having tried every model CZ ever made they are all about the same..I have to admit some are just a hair hotter due to their calibration and two partners with like models could have one that is just a little bit hotter..Lately got that question several times so putting my opinin before the forum...I do like the 10 inch depth meter (digital) over the 8 inch (analog) as 10 inchers call for more investigation especially above ground before I dig..Come to think of it have never had a rusty nail read 10 inches but have dug some awful deep (whatchamacolics)...when reading 10 on depth meter..