A couple of days ago - I got a new toy -. A Hanna Marin Master 97115. Ir was not cheap but as my wife always say - the difference between the toys for the boy and the man its the price.
Till now - I´m rather impressed. For the first time I feel rather comfortable with measuring low concentrations of phosphate with hobby gears ( However, it feels more like a semi professional piece of equipment than a pure hobby thing)
Manny years ago - I did (with a professional equipment) a investigation in my present aquarium according PO4 variations on a daily base. I found there that there was a clear difference between morning (before light on) and evening (before light off). I have tried to repeat findings with Hanna checker - but I never get more than indications and not consistent results that back up the findings before. I have not access to that equipment I use 10 years ago today. But the Hanna Marine Master ULR PO4 seems to manage this. I have done some measurements and it seems promising - soon we maybe can start another huge discussion about PO4 measurements and what they tell us. I´ll think that this graph can be surprising - but really not for me
The error bars is the methods accuracy (±0.02 mg/L)
HMM will also introduce a new method (at least for me) that may can help us to understand total ammonia in our reef. The accuracy of this method is 0.05 mg/L and the question is if it is enough to make it useful for detecting daily swing. There is very few total ammonia measurements done on mature aquarium reefs so no one really knows "natural concentrations". At least can my measurements give us a floor because it seems to be stable results - indicating lower in the morning and higher in the evening - but it is variation within the margins of error for the moment
The Marine Master can detect pH, Alkalinity, magnesium, calcium, High NO3, Low NO3, ULR NO2, Low total Ammonia (NH3+NH4) and ULR PO4.
PH reading have an accuracy of ± 0.2 in pH and it is not good enough if you - as I have - an pH meter.
I have test calcium and magnesium twice and Hannas result is not the same as I get from my Salifert test (around 488 mg/L for HMM compared with 430 for salifert. However - HMM:s accuracy is ± 6% of read value. I have to learn it better and later on - compare with an ICP-MS test The test is tricky - you only use 0.1 ml sample and its complicated. I´have to train and see what's coming up later
I get rather high Mg readings too - but there I do not really knows where I should expect to be. Its also a tricky test. Have a learning curve. My reading now is 1420 and last ICP said 1367. If I still have around 1360 on ICP - the HMM:s reading is inside the accuracy (±5 % of read value)
High NO3, ULR NO2 and alkalinity works as good as corresponding checkers. Low NO3 - haven´t test. Will do that further on. That test is not included in the package.
On the whole, I am satisfied with the purchase of the HI97115. The Bluetooth connection and the Hanna lab app are good accessories together with Hanna cloud.
Sincerely Lasse
www.aquariumcomputer.com
