Hanna Instruments HI 731225 Plastic 15mm Caps for Cuvettes (Pack of 4) Vet Refractometer A: As often as you

A: As often as you think you need to   A rule of thumb is once every 30 tests or 4 months   This fluid is a cheap form of insurance against inaccuracy

Item Description: RHSN-10ATC Portable Heavy Duty Salinity Refractometer

easy to read digits Auto shut-off

200X (If you need 400X

Hanna Instruments HI 731225 Plastic 15mm Caps for Cuvettes (Pack of 4) Vet Refractometer A: As often as youItem Description: Hanna Instruments HI 731225 Plastic 15mm Caps for Cuvettes (Pack of 4) Product Features Caps for HI 731225 cuvettes to prevent spillage Screw top to stay securely fastened to cuvette and help keep sample from becoming contaminated Plastic construction for durability for HI713 HI736 HI764 HI755 HI758 checker HI 731225 is a set of plastic caps made for HI 731321 glass cuvettes, to prevent spillage and help protect samples from