The E-Z Red hydrometer battery tester is made to stand up to tough treatment in service stations and garages. It's designed so that both customer and technician can see the state of the battery acid. This battery tester is economical; your first cost is your only cost. There are no replacement parts...

OTC's No. 4619 Professional Battery Hydrometer displays a batteries specific gravity (density) on an easy-to-read float with a scale ranging from 1.100 to 1.300. Hydrometers are used to test the state of charge of a battery cell. This is performed by measuring the density of the electrolyte, which i...

Ade Advanced Optics SSA0010 dual scale salinity refractometer is used to measure, monitor and control the concentration of salt water and brine, especially useful for aquarium and marine applications. This high quality refractometer measures on 2 scales, Specific Gravity (D 20/20) and parts per thou...

Instant Ocean SeaTest Hydrometer

La Crosse Technology WT-137U Digital Thermometer/Hygrometer with Comfort Meter Easy to read and Accurate all at once, have your temperature & humidity right now! Displays current degrees in either Fahrenheit or Celsius, and relative humidity percentage. Colorful bar scale showing you the comfort l...

Design Lightweight aluminum construction Ergonomic, comfortable & easy operation Anti-slip, rugged body with durable & hygiene smooth aluminum grips Translucent bule background Durable High quality all-aluminum body Value 3 year warranty High quality assurance from leading refractometer factory Comp...