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I just bought 5ml for £8....did a bit of searching and found this if anyone is interested:
Manometer Fluid - Various Specific Gravities - Blue and Red
has a SG (specific gravity) of 1.88 which is for model REGU35 AND REGU40
Manometer Fluid - Various Specific Gravities - Blue and Red
has a SG (specific gravity) of 1.88 which is for model REGU35 AND REGU40