John P Coates
Member
Hi Jaap,I am between the HM PH-200 and the Milwaukee PH55
http://www.osmotics.co.uk/products/HM-Digital-PH%2d200:-Waterproof-pH-Meter.html
http://www.ebay.co.uk/itm/Milwaukee..._Measurement_Equipment_ET&hash=item19f272d477
The first is more accurate than the second....any suggestions? Are they both reputable companies?
Yes, the PH-200 is specified as having an accuracy of +/-0.02pH, whereas the PH55 quotes +/-0.1pH. In the UK, they are priced at £50 and £40, respectively. I don't know much about the company Milwaukee Instruments. When I unboxed my PH-200 yesterday, I was disappointed to find that there were only a few droplets of storage solution in the protective cap even though the cap was attached firmly in place. I chose to calibrate it using the sachet of cystals, which I dissolved in RO water.
JPC