Refractometer What is better? See details …?

That was refractometer of these two is better? Please help! February 1 http://cgi.ebay.com/New-Salinity-Refractometer-0-10-Aquarium-Salt-Water_W0QQitemZ250515454652QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a53e27abc http://cgi.ebay.com/New-ATC-Salinity-sg-Refractometer-4-Aquarium_W0QQitemZ200350711585QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2ea5d53f21

personally … I was going to the number 1 … for the cost and brand. I've never seen the second. good luck fish hobbyist

Water Parameters Pt6 of 9.mov

Extech RF20 0 Parts per Thousand to 100 Parts per Thousand Automatic Temperature Compensation Salinity Refractometer $62.99 Salinity refractometer measures the concentration of dissolved salt in water — Includes: (1) Carrying Case; (1) Calibration screwdriver…

Sybon Refractometer with Automatic Temperature Compensation $49.99 For the most precise measurement of salinity, the experts use a Refractometer. This high-tech instrument is used to measure salinity when perfect conditions are needed for breeding, or keeping very delicate corals. This easy-to-use and read device will allow you to keep track of your tank’s salinity fluctuations. This instrument also features ATC, automatic temperature compensation that will allow…

Extech RF41 Portable Battery Coolant/Glycol Refractometer with Automatic Temperature Compensation (°C) $79.99 Extech RF41 Portable Battery Coolant/Glycol Refractometer with ATC (?C) Measures the freezing point of coolants and concentration of Ethylene/Propylene Glycol…

Extech RF12 Portable Brix Refractometer (0 to 18%) with Automatic Temperature Compensation $99.99 Extech RF12 Portable Brix Refractometer (0 to 18%) with ATC…

Extech RF11 Portable Sucrose Brix Refractometer (0 to 10%) with Automatic Temperature Compensation $89.99 Extech RF11 Portable Sucrose Brix Refractometer (0 to 10%) with ATC…