Here’s the franklin 710 vs m210 – Buying Guide

Features

• ACCURATE: More sensors = More accuracy. Conventional stud finders have 1 or 2 sensors. The ProSensor T6 has 6, making it the most accurate stud sensing tool on the market. The ProSensor T6 has a max detection depth of 1.5". The precision LEDs track the location of studs while displaying the center and edges simultaneously.
• EASY: One mode finds it all! The ProSensor T6 adjusts for a variety of depths, materials and textures. No calibration required. Press and hold the button to begin scanning. Unlike other stud sensors that give false readings, the ProSensor T6 allows you to start scanning anywhere, even over a stud.
• DISPLAYS FULL STUDS: The ProSensor T6 displays the center and edges of studs simultaneously, showing single studs that other stud finders cannot detect.
• COMPATIBILITY: The ProSensor T6 is recommended for interior drywall only. Do not attempt to use through stucco, exterior siding, concrete, brick, flooring or tile.
• MORE INFO: Requires two AAA batteries (not included). Is NOT compatible with rechargeable batteries.