February 21, 200521 yr comment_40220 Purchased a refractometer from the USA for $90us Auto temperature adjustment etc. Works great. www.benmeadows.com Report
February 21, 200521 yr comment_40244 that price sounds a bit steep to me Duke. i think i only paid about have that for mine from the U S of A :roll: Report
February 21, 200521 yr Author comment_40254 Does yours have Automatic Temperature Control ? They are quite a bit cheaper with out this option. Report
February 21, 200521 yr comment_40267 How does ATC work on a refractometer when you have such a small ammount of water... or is it an ambiant temp correction, implying you have to allow the sample to sit for a time on the slide before reading???? Pies - you are normally a source of knowledge on these matters.... ideas? Report
February 21, 200521 yr comment_40268 I think it uses the expansion of a metal to alter the distance of the reading lines with temperature. Once the water sample reaches the same temp as the refractometer, then it is temperature compensated. (water's optical density changes with temp, which changes how much the light refracts (bends) when entering the sample) Layton Report
February 21, 200521 yr comment_40270 that was my thinking also... thermocouple action going on... this does imply that you would have to wait for temp of sample to equalise with the unit, and if the unit had been stored in a cold cupboard etc... it may take a little while..... Report
February 21, 200521 yr comment_40272 I don't think thermocouple, more a metal with a high thermal expansion coefficient. this does imply that you would have to wait for temp of sample to equalise with the unit Yip and if the unit had been stored in a cold cupboard etc... it may take a little while..... Maybe. Water has a relatively high specific heat capacity, and glass (or whatever they use for the viewing window), has a relatively low heat transfer coefficient. Layton Report
February 23, 200521 yr comment_40487 My refractometer arived yesterday and sorry to say Duke but i think you got stung i payed $85nz landed and is calabratable with ATC. Says in the instruction to leave sample in refractometer for at least 30seconds before taking reading so i think layton is right Once the water sample reaches the same temp as the refractometer, then it is temperature compensated. also states that it sould be calabrated at 20 dgrees c with RO water. Dave Report
February 24, 200521 yr Author comment_40531 The important thing is the women still things I got a great deal..... poor me. Anyway I'm still pleased. Hollywood quoted near $200. So still a good deal as far as I'm concerned. A great tool for piece of mind... 1.0027 was my water reading. Not any more Report
February 24, 200521 yr comment_40536 I can sell you a brand new one for $170.00. Will be the same as the one Hollywood is selling. Report
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.