OPTi Digital Handheld Refractometer - Aquarium and Environmental (Seawater PPT/Seawater SG)

OPTi Digital Handheld Refractometer - Aquarium and Environmental (Seawater PPT/Seawater SG)

Regular price £240.00 Sale

This tri-scale digital refractometer has been designed for the measurement of seawater/saltwater. It comes programmed with both Seawater PPT (parts per thousand) and Seawater Specific Gravity (SG) scales, as well as having an empty scale ready to be defined by the use. This refractometer is ideal for testing water in saltwater aquariums as well as for environmental use such as assessing salt marshes or lakes without the need for additional calculations.

The design of the OPTi digital refractometer makes testing salt water aquariums easy. Simply use a pipette to apply a very small sample to the easy clean prism dish and press “read”. The OPTi will give you your reading. No mess and no ambiguity.

Scale A is set to Seawater PPT

Scale B is set to Seawater SG

Scale C is empty: User Defined 

The OPTi Digital Handheld Refractometer - Aquarium and Environmental (Seawater PPT/Seawater SG) scales are preselected at despatch, but may be reassigned using the scale selection method detailed here.

Portable, powerful, and ready to go

The OPTi® Digital Handheld Refractometer from Bellingham + Stanley puts a powerful, fully portable instrument in the palm of your hand. Powered by just 2xAAA batteries, the OPTi refractometer can take 10,000 readings in 50 common refractometer scales.

OPTi refractometers are made in the UK and feature a durable IP65 rated housing, a stainless steel prism dish which rapidly stabilises sample temperature, and a clear LCD display. All tri-scale OPTi refractometers have the ability to measure across the full 0-95 °Brix range.

To learn more about OPTi Digital Handheld Refractometers click here, or to read about Eclipse optical refractometers click here.

Refractometer Shop is proud to stock a series of OPTi Digital Handheld Refractometers with pre-selected scales to suit a wide range of applications. If you require a specific configuration and wish to buy in bulk please contact us today to see how we can help. 


Technical information

Product code: 38-01RS-A35-B36-C00

Scale A

Range: 1-180
Resolution: 1
Accuracy: ±1

Scale B

Range: 1.000-1.090
Resolution: 0.0005
Accuracy: ±0.001

Scale C

Range: empty
Resolution: empty
Accuracy: empty


Frequently bought with OPTi

AG 40 calibration fluid - £39.99

AG Fluids are aqueous solutions that cover the range 1.33-1.40 RI (0-40 °Brix equivalent) and have a shelf life of 12-months. Add to your order for free shipping within the UK.