Quick answer. This page sells two different instruments, so first decide which job you are buying for; for both, the answer turns on what keeps the reading trustworthy. For a polarimeter that means the light source, the observation tubes, temperature control and the reference used to check it: a half-shade student model teaches the most, while semi-automatic and digital models remove operator judgement. For a micropipette it means the tips it takes, how often it needs gravimetric calibration, and whether seals and piston can be replaced. Quote code and full name together, because MP codes repeat in two other ranges.
This listing holds two unrelated instrument families: polarimeters, from a half-shade student instrument through research, disk, semi-automatic and digital automatic models, and micropipettes, in economy and regular grades with fixed and variable volumes. Both are precision instruments whose usefulness depends entirely on calibration.
Read this before ordering. The codes here begin at MP-0001, and so do the codes in the companion listing Miscellaneous Products, which carries test sieves, analysers and analysis kits. The same prefix is used again by the magnet range under Magnetism Physics Equipments. MP-0003 is therefore a disk polarimeter here, a sieve shaker in the companion listing, and a U-shaped magnet in the magnetism range. Quote the code and the full product name on every enquiry and order, and ask the supplier to confirm both before shipping.
| Instrument | What it suits |
|---|---|
| Half-shade student polarimeter | Teaching the principle and the half-shade matching technique; the cheapest and the one that teaches most, because the student makes the judgement |
| Research polarimeter | Higher resolution visual work where a reading has to be defensible |
| Disk polarimeter | Routine readings; ask what distinguishes it, since the name describes the scale rather than the capability |
| Semi-automatic and digital automatic | Routine and high-throughput work, where the instrument finds the null and displays the rotation, removing operator variation |
For every one of them, ask these, because none is in the product names:
The listing offers economy and regular grades, each in fixed and variable volume. The grade difference will be in the accuracy and precision figures and in how well the instrument holds them over time, so ask for the accuracy and precision specification at the top, middle and bottom of each volume range, not a single headline figure, and ask against which standard those figures are quoted. A variable pipette is always least accurate at the bottom of its range, which is why a method that needs small volumes wants a pipette whose range brackets them rather than one turned down to its minimum.
Then the three things that decide whether the pipette is usable:
Two operating points worth putting in the laboratory rules: a micropipette is never turned past the ends of its range, which damages the mechanism, and is stored upright on a stand rather than lying down, so that any liquid drawn into the barrel cannot run back into the mechanism. Ask whether a stand is supplied.
Beyond the shared code series described above, note that this category exists as a continuation of another with the same name, which means neither name describes its contents and neither can be found by anyone searching for a polarimeter or a micropipette. Quote codes with names. Ask also for the manual, the quantity per student group where it is a teaching purchase, the consumables and their prices, the supply voltage, frequency and plug type for your country for the automatic polarimeters, the local service and calibration arrangement, and the warranty. Any accuracy or resolution figure quoted is confirmed in writing on the quotation; ask for the conditions behind it.
The sodium lamp a polarimeter needs, and spectrometers and refractometry-adjacent optics, are under Optics Physics Lab. Test sieves, analysers and analysis kits are in the companion listing Miscellaneous Products. The balance a pipette is calibrated against is under Lab Balances and Scales, the water for standards under Water Distillations and Stills, gel and separation work under TLC and Electrophoresis Apparatus, and sterilisation and incubation under Autoclaves, Sterilizers and Shakers.
Quote the code and the full product name together. For example a half-shade student polarimeter with the tube lengths supplied, the scale least count and the sodium lamp arrangement stated; or variable-volume micropipettes in the ranges your methods use, with the accuracy and precision figures at the top, middle and bottom of each range, the tip type and price per thousand, and the calibration interval and local service cost confirmed in writing. Contact Ray Export for specifications, prices and lead times.
For teaching the principle, the half-shade student polarimeter is the one to start with: the student makes the matching judgement at the half-shade, so it teaches the most. A research polarimeter suits visual work where a higher-resolution reading has to be defended. The semi-automatic and digital automatic models find the null and display the rotation themselves, which removes operator variation and suits routine or high-throughput readings. MP-0003 is the disk polarimeter; ask what distinguishes it, because its name describes the scale rather than the capability.
Check this before ordering, because none of the product names say. A polarimeter needs monochromatic light, and the standard source is a sodium lamp. If the instrument has no integral source, the lamp with its ballast and housing is a separate purchase, available on this site under Optics Physics Lab. Without a monochromatic source the instrument cannot run the standard sugar determination, so ask for the light source arrangement to be stated on the quotation along with the scale range, least count and the tubes supplied.
The rotation measured is proportional to path length, and a method specifies the tube length, so ask which observation tubes are supplied, their lengths, and whether water-jacketed tubes are available. Optical rotation also varies with temperature, which is why a specific rotation is quoted at a stated temperature; ask whether the instrument or tube can be thermostatted, and if not, record the sample temperature with every reading. Finally, confirm whether the scale reads in angular degrees, sugar degrees or both, since confusing the two is the commonest error in sugar work.
Both grades come in fixed and variable volumes. The difference shows in the accuracy and precision figures and in how well the pipette holds them over time, so ask for those figures at the top, middle and bottom of each volume range rather than a single headline number, and ask against which standard they are quoted. A variable pipette is least accurate at the bottom of its range, so pick one whose range brackets the volumes your method needs instead of one turned down to its minimum.
Three things decide whether it stays usable. Tips: ask which tips it takes, whether generic tips fit, and whether sterile or filtered tips are available, because a pipette that accepts only one maker's tips ties you to that supply. Calibration: it drifts with use and needs periodic gravimetric calibration against a balance, so ask the interval, whether it is user-adjustable, and who performs it in your country. Service parts: ask whether seals, O-rings and the piston are replaceable, and whether it is autoclavable whole or only the lower part.
Codes on this page begin at MP-0001, and so do the codes in the companion listing Miscellaneous Products, which carries test sieves, analysers and analysis kits. The magnet range under Magnetism Physics Equipments uses the same prefix again. As a result MP-0003 is a disk polarimeter here, a sieve shaker in the companion listing and a U-shaped magnet in the magnetism range. Always quote the code together with the full product name, and ask for both to be confirmed before the goods are shipped.
Ray Export is a manufacturer and exporter of laboratory, scientific and educational equipment based at Plot No. 449, HSIIDC Industrial Area, Saha, Ambala, Haryana 133104, India. Enquiries: [email protected], +91-9817319615.
Written by Palak Mall, Senior Content Writer. Technically reviewed by Arvind Kumar, Lab Equipment Specialist, 12+ years in laboratory and testing instrumentation. Last updated: 18 October 2026.
Specifications for every item, including scale range, least count, resolution, repeatability, tube lengths and pipette volume ranges, are confirmed in writing on the quotation. For certificates, contact us for the latest copies of the relevant certificates. No price is quoted on this page. Listing notes: the MP code series here repeats in the companion Miscellaneous Products listing and in the magnetism range, so MP-0003 names three different products; and the category name describes neither polarimeters nor micropipettes.
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