When you're shopping for a used benchtop analyzer, the first decision isn't brand loyalty-it's which measurement principle fits your lab's workload. On one side is the Ohaus MB23, an infrared moisture analyzer aimed at grain and similar samples. On the other is the Qualigen FastPack IP, an immunoassay analyzer built for clinical blood testing. Both analyzers are bench-scale instruments, but they serve different benches.
Quick verdict
Choose the Ohaus MB23 if your daily work is moisture measurement and you want the lower-priced analyzer of the two, listed at $300. Choose the Qualigen FastPack IP if your lab runs immunoassay work and needs the analyzer dedicated to that workflow; it's listed at $650.
Listed price and function at a glance
| Product | Listed price | What it does | Price bar |
|---|---|---|---|
| Ohaus Moisture Analyzer MB23 | USD 300.00 | Moisture-content analysis | |
| Qualigen FastPack IP Immunoassay Analyzer | USD 650.00 | Immunoassay analysis |
The listed price spread between the two is $350. That gap reflects two different analyzer categories, not an upgrade within the same class.
Where each product wins
Ohaus MB23 wins for moisture work. The heating chamber, sample pan holder, and removable metal sample pan make up the core setup for measuring moisture content in grain or similar materials. The unit powers on, though its calibration is out of date and it has not been run through a complete moisture-analysis cycle.
Qualigen FastPack IP wins for immunoassay menus. This compact system is designed for physician-office and small-lab settings, with one-touch operation and results in about 12 minutes. For labs already performing serum or plasma assays such as Total PSA, Testosterone, hCG, or Vitamin D, that workflow is the key advantage.
Product notes
Ohaus Moisture Analyzer MB23
This used MB23 powers on, and the display and controls respond as shown. The heating chamber, sample pan holder, and removable metal sample pan are included, so you have the working components for infrared moisture analysis. The unit shows cosmetic wear, surface marks, and residue from previous lab use, and it would benefit from a thorough cleaning. The previous calibration label is out of date, and no current calibration or accuracy certification is included. The unit has not been run through a complete moisture-analysis cycle, so it is sold as powered on but otherwise untested. The concrete reason to choose it is its direct moisture-analysis role; the practical limitation is that you'll need to clean, recalibrate, and validate it before trusting its readings.
Qualigen FastPack IP Immunoassay Analyzer
This used FastPack IP is a compact benchtop immunoassay system suited for physician-office and small-lab settings. Its one-touch operation and roughly 12-minute time to result make it a strong match for labs that run serum or plasma immunoassays such as TSH, Free T4, Total PSA, Testosterone, hCG, or Vitamin D, depending on the reagents you have. The reason to choose it is the automation it brings to that specific menu: you get quantitative results in a short cycle with minimal hands-on steps. The practical limitation is that its utility depends on having the matching reagents for the analytes you intend to report; without that reagent menu, the analyzer isn't doing the work. It is a used instrument.
Final choice by use case
If your lab's bottleneck is moisture-content testing, the Ohaus MB23 is the analyzer that maps directly to that job. If your lab's workload is immunoassay testing for thyroid, prostate, or hormone markers, the Qualigen FastPack IP is the system that fits that workflow. Each analyzer is a meaningful purchase for a different bench, so let the assay type drive the decision.
