Need a working analytical balance but not sure whether to buy a used classic or a new open-box electronic model? When you're comparing lab balances scales, the choice often comes down to how much precision you need and how much wear you can accept. The Mettler AE 100 and A&D FX-300iN are two very different paths to the same job: precise lab weighing. Here's how to pick between them.
Quick verdict
If your lab is on a strict equipment budget and can handle some prep work, the used Mettler AE 100 covers analytical weighing at $150. If you prefer a fresh unit with higher resolution for biological lab work, the A&D FX-300iN at $330 is the stronger choice.
Price and feature comparison
| Feature | Mettler AE 100 | A&D FX-300iN |
|---|---|---|
| Price | USD 150.00 | USD 330.00 |
| Condition | Used | New - Open box |
| Lab discipline | Physical Laboratory | Biological Laboratory |
| Balance type | Analytical Balance | Analytical Balance |
| Notable extras | Draft shield | 320g capacity, 0.001g readability, 1-second stabilization |
While both are analytical balances, the AE 100 is the lower-cost route and the FX-300iN is the higher-spec route. Your lab discipline and tolerance for setup tasks will point you to the right one.
Where each product wins
- The Mettler AE 100 wins on price. The used unit keeps the upfront cost lower than the electronic model.
- The A&D FX-300iN wins on condition. The new open-box status means you're not inheriting wear from previous use.
Product notes
Mettler AE 100 Analytical Balance Laboratory Scale with Draft Shield
The Mettler AE 100 is the budget-friendly route into analytical weighing. It's a used unit that shows scuffs and blemishes, so cosmetic perfection shouldn't be the expectation. It remains functional but will need calibration, and no calibration weights are included. If your lab already owns a calibration weight set or has a service schedule, this can be a practical addition to a physical laboratory bench. The draft shield is a genuine asset for minimizing air-current interference during measurements. The biggest trade-off is that you're accepting visible wear and taking on the calibration step yourself. For a lab with limited funds and calibration resources, the AE 100 keeps the upfront cost low while still putting an analytical balance in place.
A&D Electronic Precision Balance Scale Model FX300iN
The A&D FX-300iN is listed as New - Open box, so the unit is new but the original box and directions are missing. An asset tag is attached to the bottom, and you'll need to download the manual online before operation. The high-resolution readability of 0.001g and the 320g capacity make it particularly well suited to biological lab tasks where small mass differences matter. The fast 1-second stabilization time also helps keep workflows moving. Because it's designed as a legal-for-trade scale, it may be a better fit in settings that need defensible measurements. The higher price reflects the new-unit condition and the precision specifications, making it the choice for labs that prioritize resolution over upfront savings.
Final choice by use case
Choose the Mettler AE 100 for a physical laboratory where budget matters most and calibration weights are already on hand. Choose the A&D FX-300iN for a biological laboratory that demands precision and a new, open-box unit, and where downloading the manual is a minor inconvenience.
If you need small mass differences resolved quickly, the FX-300iN's specifications justify the larger investment. If you can wait for calibration and work around a few scuffs, the AE 100 leaves money in the budget for other equipment.
