Choosing a 40L overhead stirrer for your lab usually comes down to how you balance capacity with the types of liquids you actually mix. Both stirrers below list a 40L maximum mixing volume and a 100-2000 RPM speed range, but their listed differences in viscosity handling and stand adjustability can point you in different directions. So, how do you choose? Here's a head-to-head look at the RATTM MOTOR overhead stirrer at USD 135.00 and the ES-40M digital overhead stirrer at USD 109.02.
Quick verdict: If you routinely work with thicker fluids and want a digital readout, the ES-40M gives you a listed maximum viscosity of 30,000 mPa·s and a digital tube screen. If you prefer a motor stand that can be adjusted in height, the RATTM MOTOR is the one that explicitly includes an adjustable stand (11.8-23.6 in).
At a glance
| Aspect | RATTM MOTOR Stirrer | ES-40M Stirrer |
|---|---|---|
| Listed price | USD 135.00 | USD 109.02 |
| Price bar | ||
| Max mixing volume | 40L | 40L |
| Max torque | 40N·cm | 40N·cm |
| Speed range | 100-2000 RPM | 100-2000 RPM |
| Max viscosity | 10,000 mPa·s | 30,000 mPa·s |
| Condition | New | New |
Where each product wins
RATTM MOTOR stirrer: Its motor stand can be adjusted from 11.8 to 23.6 inches, a feature that helps when your glassware varies in height. It also carries the RATTM MOTOR brand and lists a country of origin and item weight (11.9 lb), which may be useful for documentation.
ES-40M stirrer: It comes in at a lower listed price of USD 109.02 and handles a higher maximum viscosity of 30,000 mPa·s. The digital tube screen is a nice touch for speed/time readouts, and it specifies a drill clamping range of 0.8 to 10 mm.
Product notes
US丨160W Electric Adjustable Overhead Stirrer 10000mPas 40L 100-2000RPM Lab Mixer
The RATTM MOTOR overhead stirrer stands out for its adjustable motor stand, which the product details say spans 11.8 to 23.6 inches. That makes it a practical fit for users who need to position the stirrer at different heights across different containers. This unit is listed at USD 135.00, matching a maximum mixing volume of 40L and a torque of 40N·cm. On the limiting side, the listed maximum viscosity is 10,000 mPa·s, which is lower than the ES-40M's 30,000 mPa·s; if your fluids run thicker, you may need the higher viscosity spec. The product also carries the RATTM MOTOR brand and an item weight of 11.9 lb.
120W Adjustable Electric Overhead Stirrer Max 40L Digital Lab Mixer Time & Speed
The ES-40M digital overhead stirrer is positioned for higher-viscosity work, with a listed maximum viscosity of 30,000 mPa·s and a maximum mixing volume of 40L. It also includes a digital tube screen display, along with a drill clamping diameter range of 0.8-10 mm, and the product details mention a 50/60 Hz frequency. At USD 109.02, it's the lower-priced of the two stirrers. One limitation: the product details note that a GTIN does not apply, which may matter if your lab tracking system requires a unique identifier. Otherwise, it's a strong match for thick fluids and a lower listed price.
Final choice by use case
- Choose the RATTM MOTOR stirrer if you want an explicitly adjustable motor stand and a named-brand unit for your lab bench.
- Choose the ES-40M digital stirrer if high-viscosity fluids, a digital display, and a lower listed price matter more than stand height adjustability.
