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For screening of inflammation or oedema in mouse or rat

Orchid’s Digital Plethysmometer is a micro controlled volume meter, specially designed for accurate measurement of the rat / mouse paw swelling.

The Digital Plethysmometer is a highly useful tool to evaluate the inflammatory response experimentally induced in small rodents and to screen potential anti-inflammatory or anti-oedema properties of pharmacological substance. The water displacement produced by the immersion of the animal paw in the measuring tube is reflected in to the second tube, inducing the volume displacement. This displacement value is recorded. The control unit can be zeroed between successive readings by pressing the reset key, so as to avoid the error arising due to adherence of water to the paw of the animal. Foot switch allowing rapid hands-free experiments can be used to control the end point of the measurement.


  • Button touch auto- calibration mode making hassle free calibration
  • High accuracy : ± 0.01 ml
  • Resolution : 0.01 ml
  • Easy to use pedal switch
  • Stable & comfortable reading on graphical LCD display
  • No need of separate tube assembly for rat & mice
  • Data entry for: Experiment Nos./ Sequence Nos./Sex of Animal / Paw : Left – Right etc.
  • Data storage for 100000 experiments
  • Six Point Calibration 0.50ml, 1.00ml, 2.00ml, 3.00ml, 4.00ml & 5.00ml.
  • Software for PC Connectivity using RS232 serial interface for data transfer and report generation with graphical presentation.
  • Provision to add experiment name, comment & animal weight(grams) in the software report
  • Data can be transferred to excel or pdf
  • Software with password protected experiment delete function

          Parameters measured:

  • Mice Paw Volume (0-5ml), Rat Paw Volume (0-10ml)


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System Specification & Models

Specifications Model
PLM 01 Plus
Accuracy ± 0.01ml
Resolution 0.01ml
Calibration Auto and Manual
Display GLCD
Animals to be tested Mouse, Rat
PC Connectivity By Using RS232 Cable
Material of composition Methacrylate, S.S. 304

Order Information

Model Certifications Power requirements Accessories
PLM 01 Plus CE Compliant 220/230V AC 50Hz

110/120V AC 50-60Hz*

· Control unit with communication port to PC & Software utility

· Pedal Switch

· Immersion tube assembly with reservoir and adequate silicon tubing

· Two separate Stand for holding the immersion tube assembly

· Instructional Manual

· RS232 Cable and RS232 to USB      converter

· Surfactant solution bottle

· Micro-litre syringe (500 μl)

· Digital pocket conductivity meter

· Software for data connectivity


*Needs to be specified in order information

Optional: Computer and printer to be arranged by user

Note: Orchid’s continuing product development makes specifications subject to change without prior notification.


Digital Plethysmometer : 

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10. Khobragade, D.S., AK, L.R., Rao, T.K., AVR, P.K., Reddy, G.S. and Potbhare, M.S., 2013. Multi-model confirmatory evaluation of anti-inflammatory, analgesic and

antioxidant activities of Putranjiva roxburghii wall. International Journal of Biomedical and Advance Research, 4(12), pp.921-932.

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(Ka??akari) extract in laboratory animals. Ancient science of life, 32(4), p.222.

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