
After calibrating and testing with a known commercial spirit, this error was up to 5%. I would have agreed a few percent, but that was too much. I used to buy cheap refractometers and their error was less than now.

Portable digital multimeter with sound continuity and thermocouple (electric tester) LTX DT-838
7 Review

Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer
18 Review

π PH 1-14 Extensive Storage Testing Monitoring: Optimize Your Storage with Precise pH Level Monitoring
6 Review

TDS water quality tester - TDS water hardness meter (portable digital salt meter for water analysis)
9 Review

π‘οΈ Continuous Temperature Monitoring with Relative Humidity Integration
4 Review

π§ UEi Test Instruments DAFM3B Digital Multimeter
6 Review

π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review

Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review