DRY WELL CALIBRATORS ARE PRECISION INSTRUMENTS WHICH ARE USED FOR CHECKING AND CALIBRATING THERMOMETERS. THE PRIMARY FUNCTION OF THESE INSTRUMENTS IS TO GENERATE A VERY STABLE TEMPERATURE IN A SMALL VOLUME, WHICH IS THEN USED TO IMMERSE THERMOMETERS UNDER TEST FOR AN ACCURACY COMPARISON. THERE ARE THREE MODELS WITH TEMPERATURE RANGES FROM -40'C TO 660'C. THEY HAVE A METROLOGY-LEVEL PERFORMANCE IN STABILITY, UNIFORMITY, ACCURACY AND LOADING EFFECT. THE INSTRUMENTS ALSO HAVE A DUAL-ZONE CONTROL AND A PROCESS CALIBRATOR OPTION PROVIDES A MULTI-CHANNEL READOUT.

CLASSIFICATION HAS BEEN DETERMINED IN ACCORDANCE WITH THE FOLLOWING: - GENERAL INTERPRETATIVE RULES (GIR)S: GIR 1 HAS BEEN USED TO CLASSIFY THIS PRODUCT BY THE TERMS OF HEADING 9031 - MEASURING OR CHECKING INSTRUMENTS, APPLIANCES AND MACHINES, NOT SPECIFIED OR INCLUDED ELSEWHERE IN THIS CHAPTER; PROFILE PROJECTORS. GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 903180 - OTHER INSTRUMENTS, APPLIANCES AND MACHINES. CN CODE 90318080 - OTHER THAN FOR MEASURING OR CHECKING GEOMETRICAL QUANTITIES. ALSO CLASSIFIED IN ACCORDANCE WITH: HARMONISED SYSTEM EXPLANATORY NOTES (HSEN) TO CHAPTER 90 REFERS. HSEN TO HEADING 9031 REFERS.