Checktemp® Digital Thermometer – HI98501
The HI 98501 Checktemp® is a digital thermometer with stainless steel penetration probe. It delivers high accuracy temperature measurements over a wide temperature range without worrying about breakage or condensation.
or 4 payments of $21.25 with 
Digital Refractometer for Seawater Analysis – HI96822
The HI96822 is a rugged, portable digital refractometer designed for the measurement of salinity of natural or artificial seawater. The HI96822 displays results in three popular measurement units: Practical Salinity Units (PSU), salinity in parts per thousands (ppt) and specific gravity (S.G. (20/20)). The instrument’s high accuracy and simple operation gives reliable results each and every time. All readings are automatically compensated for temperature variations and displayed within a 1.5 second response time. The sealed flint glass prism and stainless steel well are easy to clean. Just wipe with a soft cloth in preparation for the next sample.
or 4 payments of $97.50 with
Marine Salinity Tester – HI98319
Designed to bring simplicity to salinity testing during any process, the HI98319 Marine Salinity Tester measures conductivity (EC) to determine the salinity of natural and artificial seawater. Within seconds, the salinity and temperature are digitally displayed on the LCD in parts per thousand (ppt), Practical Salinity Units (PSU), or specific gravity (S.G.). The HI98319 Marine Salinity Tester comes with all the necessary calibration solutions and batteries, everything you need to get started testing the salinity of your aquarium right away.
or 4 payments of $32.25 with