Salinity Refractometer 0 to 100 ppt, temp compensated.

For those of you who are looking for something more accurate than even the Digital Tester above then we have the original 'Refractometer' a superb, if not expensive piece of equipment for the connoisseur

(Reference 8.0.80)
A salinity refractometer used to determine the salinity content of water, this is a great instrument, much better than a hydrometer for routine salinity measurements. Salinity refractometer for the range 0 to 100 ppt, resolution is better than 1 ppt, temperature compensated.

We have used one of these for the past 15 years
and it cost a lot more than they do today

Price: £129.45 + Vat in the UK and EEC