Quick Take
Data acquisition recorders are the practical bridge between a sensor signal and a permanent paper record. The hard part is choosing one when the listings are all used or carry condition caveats. The Omega RD71 is a parts-or-repair project, the Kipp & Zonen BD 41 is an untested unit at the low end of the price range, the Barnstead/Thermolyne is a used recorder with visible wear, and the Honeywell DR4300 carries the highest listed price.
Listed Prices at a Glance
| Product | Listed price | Price bar |
|---|---|---|
| Omega RD71 Engineering Chart Recorder FOR PARTS OR REPAIR UNTESTED AS IS READ | USD 347.23 | |
| Kipp & Zonen BD 41 Chart Recorder Powers On/Untested | USD 45.00 | |
| Barnstead/Thermolyne Linear LR93125 1200 Series Chart Recorder | USD 450.00 | |
| Honeywell DR4300 Truline Chart Recorder DR4312-22EE-G0100-0000-0000-00-000-E0 | USD 550.00 |
The listed-price spread runs from USD 45.00 to USD 550.00. Price alone won't settle the choice-the condition descriptions matter more than the gap.
Decision Matrix
| Need | Suggested pick from these listings | Why |
|---|---|---|
| Lowest entry cost | Kipp & Zonen BD 41 | Powers on and responds to buttons, but untested |
| Repair project or spare parts | Omega RD71 | Motor spins when switch is actuated; listed for parts or repair |
| Used recorder without a repair framing | Barnstead/Thermolyne LR93125 | Used, overall good, with visible cosmetic wear |
| Clearly identified Honeywell unit | Honeywell DR4300 | Model and MPN are in the listing |
Product Notes
Omega RD71 Engineering Chart Recorder FOR PARTS OR REPAIR UNTESTED AS IS READ
The Omega RD71 is listed for parts or repair, which tells you where its value lies. The description says it powers on and the motor spins when the switch is actuated, but loose debris is inside and the unit has not been fully tested. If you like troubleshooting or need a donor for components, this unit gives you a plausible starting point. The limitation is that it is sold as is, so you will be the one resolving whatever keeps it from being fully operational.
Kipp & Zonen BD 41 Chart Recorder Powers On/Untested
At USD 45.00, this is the most affordable chart recorder in the set. The unit turns on and things move when different buttons are pressed, so the basic controls are responding. It is still untested, and no power cord is included, so you should expect to supply power and verify the recording function yourself. The price makes it a reasonable gamble if you want a low-cost project or a spare unit for calibration work, but it is not a plug-and-play recorder.
Barnstead/Thermolyne Linear LR93125 1200 Series Chart Recorder
This used recorder is described as having cosmetic wear in the form of scratches and scuffs, while the overall condition is good. It comes as pictured, so the photos are your main tool for judging the surface condition. That is the main reason to pick it: a used unit without the untested or parts-only framing. The trade-off is that you'll be inspecting visible wear closely, and the listed price sits above the entry-level Kipp & Zonen unit. If you want a straightforward used chart recorder, this is the middle ground.
Honeywell DR4300 Truline Chart Recorder DR4312-22EE-G0100-0000-0000-00-000-E0
The Honeywell DR4300 listing has the most explicit identification, with a full MPN in the title. The unit is described as used, in good condition, with minor cosmetic wear, and the listing states a 30-day warranty. It does not come with a power cord or accessories, and the red or purple tips may not be present. If you want a Honeywell model with a clear model/MPN chain and a stated warranty, this is the top-priced pick.
Final Recommendation
Go with the Kipp & Zonen BD 41 if you want the lowest listed price and are comfortable testing the unit yourself. Choose the Barnstead/Thermolyne LR93125 if you prefer a used unit without the untested or parts-only caveat. Pick the Honeywell DR4300 if you want the clearer model/MPN identification and the stated 30-day warranty. Consider the Omega RD71 if your plan is a repair project or parts source-remember that it is untested and listed as is.
