Does not have an NPT thread. It uses straight threads on the female side of the meter and British pipe threads on the male side. The K-factor for water starts at around 40.0, but mine required a K-factor of 40.25 for general accuracy.
Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer
18 Review
π― Honey Refractometer with Automatic Temperature Compensation (ATC) - Tiaoyeer Moisture, Brix, and Baume Refractometer for Honey, 58-90% Brix Scale Range - Honey Moisture Tester
31 Review
Portable digital multimeter with sound continuity and thermocouple (electric tester) LTX DT-838
7 Review
80 Pieces Water Test Litmus Strips Litmus ph Paper Soil Acidity Meter Liquid pH Tester 1-14
10 Review