What is the correct temperature factor for a typical hydroponic solution? Most meters seem to use NaCl (~2) but wondering if that is at all appropriate for nutrients.

Here is the table from wikipedia

Code:
Aqueous solution at 25 C	Concentration (mass percentage)	                                       α (%/C)
HCl	                                        10	                                        1.56
KCl	                                        10                                       	1.88
H2SO4                                         	50	                                        1.93
NaCl                                    	10                                      	2.14
HF                                          	1.5	                                        7.20
HNO3                                          	31	                                        31