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British Wildlife

8 issues per year 84 pages per issue Subscription only

British Wildlife is the leading natural history magazine in the UK, providing essential reading for both enthusiast and professional naturalists and wildlife conservationists. Published eight times a year, British Wildlife bridges the gap between popular writing and scientific literature through a combination of long-form articles, regular columns and reports, book reviews and letters.

Subscriptions from £40 per year

Conservation Land Management

4 issues per year 44 pages per issue Subscription only

Conservation Land Management (CLM) is a quarterly magazine that is widely regarded as essential reading for all who are involved in land management for nature conservation, across the British Isles. CLM includes long-form articles, events listings, publication reviews, new product information and updates, reports of conferences and letters.

Subscriptions from £22 per year
Wildlife Survey & Monitoring  Aquatic Survey & Monitoring  Water Testing  Water Testing Meters

Digital Refractometer for Salinity Measurements

Manufacturer: Hanna Instruments
Digital Refractometer for Salinity Measurements
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  • Digital Refractometer for Salinity Measurements Usually dispatched within 4 days
Price: £299.99
About this product Specification Customer reviews Related products

About this product

This Digital Refractometer is a rugged, portable, water resistant device that utilizes the measurement of the refractive index to determine the salinity of natural and artificial seawater, ocean water or brackish intermediates.

This unit eliminates the uncertainty associated with mechanical refractometers and is rugged and portable enough to be used at home, in the lab and out in the field. It is quick and easy to use and can be calibrated with distilled or deionized water.

The refractive index is measured and can be converted into one of 3 popular measurement units: Practical Salinity Units (PSU), Salinity in parts per thousand (ppt), or Specific Gravity (S.G. (20/20)). All conversion algorithms are based upon respected scientific publications using the physical properties of seawater (not sodium chloride).

Temperature (in degrees Celcius or degrees Fahrenheit) is displayed simultaneously with the measurement on the large dual level display along with icons for Low Power and other helpful message codes.



Range (PSU): 0 - 50
Range (ppt): 0 - 150
Range (Specific Gravity 20/20): 1.000 - 1.114
Range (Temperature): 0 - 80 degrees Celcius (32 - 176 degrees Fahrenheit)
Resolution (PSU): 1
Resolution (ppt): 1
Resolution: (Specific Gravity 20/20): 0.001
Resolution (Temperature): +/- 0.1 degrees Celcius (0.1 degrees Fahrenheit)
Accuracy (PSU): +/- 2
Accuracy (ppt): +/- 2
Accuracy (Specific Gravity 20/20): +/- 0.002
Accuracy (Temperature): +/- 0.3 degrees Celcius (0.5 degrees Fahrenheit)
Temperature Compensation: Automatic between 10 and 40 degrees Celcius (50 - 104 degrees Fahrenheit)
Measurement Time: Approximately 1.5 seconds
Light Source: Yellow LED
Sample Cell: Stainless steel ring and flint glass prism
Auto-off: After 3 minutes of non-use
Enclosure Rating: IP 65
Battery Type / Battery Life: 9V / Approximately 5000 readings
Dimensions / Weight: 192 x 102 x 67 mm / 420 g


Customer Reviews

Manufacturer: Hanna Instruments
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