I don't know much about the Elos to compare, but here is one reefers comparative testing of a bunch of kits:
https://www.reef2reef.com/threads/p...s-pro-salifert-hanna-checkers-seachem.222628/
from it:
Winner for me is still the Hanna 736 ULR for over all cost and performance. The Elos Pro is my second choice in all this for high resolution checking.
Hanna 736 ULR Phosphorous
Pros:
- Long term costs brought down through reagent purchases
- Easy to read digital output. Best for people that have a hard time with color charts
- Resolution and Precision in the range we really need it
- Reference solution available and no user involvement needed to use
- Results remain displayed longer then the 713
Cons:
- Higher initial cost
- Reagents seems to have QA issues in the past (I haven't experienced that with this checker)
- Can be complex to execute the test
- Vials require care not to mark up as well
Elos Pro
Pros:
- Easy and fairly quick to perform
- Highest resolution of the color matching kits with more color samples to match against
- Seems fairly accurate and found it the easiest to read of the color matching kits
Cons:
- Most expensive of the kits tested minus the upfront cost of the Checkers
- Could be hard to read for those that have difficulty in matching colors as the shades of colors are very close.
