Red Sea Reef Foundation Test Kit - Old and New Kits have different readings

[Rockstacker]

Has anyone run into this before?
I have been using the Red Sea Reef Foundation test kit for many months now. I'm about to run out of reagents so I bought a new kit.
I then tested my water using the two different kits to see if they provide similar readings (they should, right?)

My tank parameters:
Water temperature: 80F
Specific Gravity: 1.025
pH: 8.2

Below is what I got with the test kits:

Lot# 162 (old)
Alkalinity = 7.7 dKH
Calcium = 400ppm
Magnesium = 1420 ppm

Lot# 293 (new)
Alkalinity = 8.8 dKH
Calcium = Over 500ppm (I used up 1ml of the titration reagent and the test sample had not yet reached the end point color)
Magnesium = over 1600ppm (I used up 1 ml of the titration reagent and the test sample had not yet reached the end point color)

Now I am not sure if my new kit is bad, or if my old kit was bad all along.
I am leaning towards the new kit being bad because those Ca and Mg readings are way too high considering what I dose.

 

[Jhuneke]

I have seen posts about a recalls for calcium reagent..
http://www.redseafish.com/calcium-B .. Not sure about any other tests though ..

 

[Rockstacker]

Thanks for the link.

I did not realize that each bottle in the kit had different lot numbers.
The lot# I listed was just for the Calcium-A.

My calcium-B has lot# 2103, which is on the recall list.
So that explains the calcium test issue.

Thanks again