Choosing among lab balances and scales is never just about the display. For semi-micro work, you need 0.01mg readability, a pan and chamber that stay stable, and enough capacity for the samples you actually weigh. The Mettler Toledo MS105 NewClassic MF Semi-Micro Analytical Balance checks the readability box, but this particular unit has a cracked draft shield and is sold as-is for parts or repair. That one physical flaw changes the entire buying decision.
Quick Verdict
At USD 789, the MS105 is a semi-micro analytical balance with 120g capacity and 0.01mg readability. The electronics and internal mechanics are described as functional, which is a good sign. But the cracked draft shield means this is not a plug-and-play lab balance. Unless you have a clear repair plan, you are buying a project, not a working instrument.
Mettler Toledo MS105 NewClassic MF Semi-Micro Analytical Balance Scale 120g
This MS105 is a NewClassic MF semi-micro analytical balance with a 120g capacity and 0.01mg readability. The internal mechanics and electronics are described as functional, so the basic weighing core appears to be fine. The reason to choose it is that 0.01mg readability gives you the sort of resolution needed for demanding analytical weighing tasks. The limitation is also clear: the draft shield housing has physical damage and the unit is sold as-is for parts or repair. Any air current or dust that gets past the cracked shield can affect readings, so the repair must be handled before the balance is fit for normal lab use.
Who It Suits
This MS105 suits a lab with an in-house technician or a buyer with experience reconditioning analytical balances. If you have access to Mettler Toledo-compatible draft shield parts, the repair may be straightforward. It also suits someone who wants a semi-micro balance for lighter sample masses and is comfortable troubleshooting a used unit. If you need a balance you can put into service immediately, this is not the right fit.
What Stands Out
The standout is the 0.01mg readability. That level of resolution is essential for semi-micro analytical work and is not something every lab balance can offer. The 120g capacity is clearly stated, and the NewClassic MF model name places this in the Mettler Toledo line. The fact that the electronics and internal mechanics are described as working is a positive detail; it means the biggest repair concern may be limited to the draft shield housing rather than the entire weighing system.
Meaningful Trade-Offs
The main trade-off is the damage. A cracked draft shield is a functional problem, not just a cosmetic one. It exposes the weighing chamber to air currents, temperature changes, and dust, all of which are enemies of stable 0.01mg readings. Because the unit is sold as-is for parts or repair, the cost of fixing the shield is an added expense you cannot avoid. The 120g capacity also means you cannot work with larger vessels or heavy samples, so the balance is only useful for the intended lighter weighing tasks.
Bottom Line
If you can repair a cracked draft shield yourself or through a trusted service, the Mettler Toledo MS105 NewClassic MF at USD 789 is a reasonable project. It offers the 0.01mg readability and 120g capacity you want from a semi-micro analytical balance, and the internal mechanics and electronics are described as functional. If you simply need a working semi-micro balance right now, skip this unit and find one without physical damage. The price only helps if you are ready to handle the repair.
