What an engine-only reader can and cannot see
The ANCEL AD310 is the only engine-only tool in this comparison, and ANCEL’s product page draws the boundary itself: it reads generic OBD2 engine codes and does not support ABS, SRS, or other specialized systems.
Two restrictions on ANCEL’s page matter more than the screen. Compatibility is stated for 1996-and-newer US, 2000-and-newer EU, and 2005-and-newer Asian gasoline and diesel vehicles, and ANCEL lists hybrid, electric, trucks, pickups, and vans as unsupported. BlueDriver and OBDLink both state that their dongles work with light trucks, and BlueDriver includes most hybrids, so a pickup owner is outside the AD310’s stated scope before the ABS question even arises.
If the only light you need to read is the check engine light, and the vehicle is a 12 V gasoline or diesel car, the AD310’s published function list covers the job. The moment an ABS or airbag light is involved, it does not, and ANCEL publishes no update path for the AD310.
Four-system handhelds share one function list
The Autel MaxiLink ML629, ANCEL FX2000-US, and Foxwell NT604 Elite document the same four modules under slightly different names: engine, ABS, SRS or airbag, and transmission (Autel says Transmission, ANCEL says TCM, Foxwell says AT). The FX2000 manual is the most specific about what you can do once you select a module: read fault code, clear fault code, read data stream, and read version information, with a note that menus may differ by manufacturer. Autel’s ML629 store page documents read and erase for those modules; Foxwell’s NT604 manual documents module access and live data for them. None of the three publishes an active test, a relearn, or a calibration.
Foxwell documents a Quick Scan that tests every installed control module automatically and reports a pass or fault status for each. The manual says it can take 10 minutes or longer depending on how many modules the vehicle has. Foxwell also documents AutoVIN, so the tool reads the VIN rather than asking you to pick a region and manufacturer, though the manual keeps the manual route too. The FX2000 manual describes a select-system, select-manufacturer, select-model flow with no automatic scan documented.
Freeze frame is not uniform across the three. Autel lists freeze frame and all 10 OBD2 test modes for the ML629. ANCEL lists freeze frame under the OBDII/EOBD diagnosing mode of the FX2000, with a per-system data stream in System Diagnosing mode. Foxwell’s Diagnostic Operations menu documents live data per module and no freeze-frame capture.
The make list is the spec that decides the purchase
A four-system or five-system claim on the box tells you which modules the tool can address in principle. The manufacturer’s coverage list tells you whether it will address those modules on your vehicle. The evidence splits cleanly between tools that publish that list and tools that do not.
BlueDriver’s compatibility page lists enhanced ABS, airbag, transmission, and TPMS coverage for GM, Ford, Chrysler, Toyota, Nissan, Mazda, Subaru, Mitsubishi, Hyundai, Mercedes, BMW, Honda, and Volkswagen, without stating a model-year ceiling. OBDLink’s OEM-specific coverage document names 24 makes for the MX+: Acura, Buick, Cadillac, Chevrolet, Ford, GMC, Holden, Honda, Hummer, Hyundai, Infiniti, Kia, Lexus, Lincoln, Mazda, Mercury, Nissan, Opel, Pontiac, Saab, Saturn, Scion, Suzuki, and Toyota. Chrysler, Dodge, Jeep, Ram, Subaru, Volkswagen, BMW, and Mercedes do not appear on it, so the count matters less than the names.
Innova documents active tests and OEM enhanced codes for the 5610 by name for Chrysler, GM, Ford, Hyundai, Nissan, and Toyota. Other 1996-and-newer vehicles get generic OBD2 coverage that Innova does not itemize.
ANCEL publishes no make or year list for the FX2000’s System Diagnosing mode, in the manual or on the product page. Foxwell publishes none for the NT604 Elite. Autel says the MK808S covers “the majority of vehicle makes and models on the market” without a count or a year range. Those three are not necessarily weaker on your car, but you cannot find out before buying, and that uncertainty is what their coverage scores reflect.
The practical rule: open the manufacturer’s list, find your make, and look for a year cutoff. If your make is absent or your model year is past the cutoff, assume engine codes only and decide on that basis.
Read and clear is not the same as command
Two of the eight tools document bidirectional control with named functions: the Innova 5610 and the Autel MK808S. Autel’s MK808S page lists bi-directional Active Tests and service functions including SAS and EPB. The MK808S is the only tool here whose maker claims Active Tests across the majority of makes rather than a named list, which is both its advantage and its gap: broader in claim, unverifiable in scope.
OBDLink markets the MX+ as “the only scan tool on the market with Bi-Directional capability,” yet its product page describes the core functions as reading and clearing the check engine light and streaming live data, and names no component actuation. A bidirectional claim with no named function is scored here as a claim, not a capability.
If your goal is to identify a fault before a shop visit, none of this applies to you.
A screen of its own, or your phone’s
The BlueDriver Pro Next-Gen and OBDLink MX+ have no display. BlueDriver describes a Bluetooth adapter that requires its free iOS or Android app; OBDLink requires its own free app on iOS, Android, or Windows, or one of 17 named third-party apps including FORScan Lite, Torque, Car Scanner ELM OBD2, Carista, and OBD Fusion.
The ML629 (2.8-inch LCD), FX2000-US (3.95-inch TFT), and NT604 Elite (4.3-inch TFT) are button-driven and each under 8 inches long by their makers’ figures.
The Innova 5610 bridges the two camps: it pairs over Bluetooth to the optional RepairSolutions2 app but operates fully without a phone.
Matching the tool to the light
Check engine light only, on a 12 V gasoline or diesel car: the AD310’s documented scope matches, and nothing else about it needs considering.
ABS or airbag light, and you want to read and clear before a shop visit: the ML629 if the vehicle is model year 2014/2015 or older and you accept that Autel publishes a make count but no make names; BlueDriver if your make is on its compatibility page and you accept a phone-only interface. The FX2000-US and NT604 Elite document the same four modules, and the FX2000-US carries the clearest update terms in the group, but you are buying either without a published make list.
A repair that needs a steering angle sensor calibration or a named active test: the Innova 5610 if you drive a Chrysler (2017 or earlier for full FCA coverage), GM, Ford, Hyundai, Nissan, or Toyota product, or the MK808S if you want the broadest claimed scope and a touchscreen and accept that Autel does not publish the make list behind it.
A phone-based tool with the most interface choice: the OBDLink MX+, provided your make is on its 24-name list.
