I prefer a pen. Main reason is i use frequently. I have had a Senz dual temp and pH pen for a few years.
This one. Did not buy it from them but the price was about the same.
Trans Instruments Digital salinity tester - Equipment for Sale - SA Cichlid Forum
PS you still need to calibrate it frequently. Not something you can just take out the cupboard and test every 3-4 months.
This one. Did not buy it from them but the price was about the same.
Trans Instruments Digital salinity tester - Equipment for Sale - SA Cichlid Forum
PS you still need to calibrate it frequently. Not something you can just take out the cupboard and test every 3-4 months.
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