Two lab balances, two very different trades: the Mettler Toledo MS105 is a used semi-micro analytical balance, while the A&D FX300iN is ready to run but missing its original box and instructions. The choice comes down to how much precision you need and how much repair work you are willing to take on.
Quick Verdict
For most lab buyers, the A&D FX300iN is the safer, faster path to a working balance. It is the cheaper of the two at $330, and it can be on the bench as soon as you have a downloaded manual. The Mettler Toledo MS105 is only worth the higher price tag if you specifically need semi-micro analytical resolution and are ready to handle a repair candidate.
Comparison Snapshot
| Consideration | Mettler Toledo MS105 | A&D FX300iN |
|---|---|---|
| Price | $789.00 | $330.00 |
| Condition | Used, as-is | New - open box |
| Balance type | Semi-micro analytical | Precision |
| Capacity | 120g | 320g |
| Readability | 0.01mg | 0.001g |
Where the Mettler Toledo MS105 Wins
The Mettler is the one to buy when resolution matters more than convenience. At 0.01mg readability, it offers the finer readings, and its 120g capacity suits small analytical samples. The trade-off is physical damage to the draft shield, so this is a repair-oriented buy.
Where the A&D FX300iN Wins
The A&D wins on ease and range. With 0.001g readability, it handles routine precision work, and its 320g capacity gives you room for larger samples. It is also not the balance that needs repair; it only asks for a downloaded manual before you start.
Mettler Toledo MS105 NewClassic MF Semi-Micro Analytical Balance Scale 120g
The Mettler Toledo MS105 is a semi-micro analytical balance from the NewClassic MF line. The electronics and internal mechanics function, which makes it an attractive repair candidate if you need that level of analytical precision and can have the draft shield housing restored. Because the unit is sold as-is with a cracked draft shield, the balance is not ready for critical measurements until that housing is addressed. If you are comfortable with a bench project, this is a way into semi-micro weighing. If you are not, the damage is a serious limitation because the draft shield is central to stable readings. Make sure you have a plan for the physical housing before you rely on this balance.
A&D Electronic Precision Balance Scale Model FX300iN
The A&D FX300iN is a new-open-box precision balance that was assembled for a marketing video. The original box and paper manual were discarded, so you will need to download the directions before you start. A company asset tag on the bottom is a practical detail to know about. For biological lab work, this balance is the lower-fuss option because it is not flagged as needing repair. It gives you a precision balance that can go onto the bench quickly once you have the manual. If you are looking for a ready-to-run lab balance and are comfortable downloading instructions, this is the more straightforward choice between the two. Just account for the missing original packaging when you plan storage.
Final Choice by Use Case
Choose the Mettler Toledo MS105 if your applications genuinely demand semi-micro analytical readings and you are comfortable with a repair candidate. Choose the A&D FX300iN for general lab weighing and biological lab use. It is the ready-to-run option and the one that fits most benches without a project waiting on you.
