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What other measurements correspond to the salinity of water?

I would like to control the salinity of water using other measures that are controllable by a meter/controller, such as pH, ORP, conductivity,etc. I need to create an environment that resembles the ocean by adding salt to fresh water but would like it set up so its automatic. So if the controller hits a certain level of the other measurements I know its time to add XX amount of salt. Does anybody have any suggestions?

Conductivity is the measure you want. Conductivity meters are almost universally used to measure salinity. They are not terribly expensive and operate very simply and reliably. For doing the job you describe, I would hope you could buy equipment off the shelf.

YSI Professional Plus Water Quality Instrument Ordering Guide

YSI Model 33 S.C.T. Salinity Conductivity Temperature meter Looks great $80.95

Meter – pH, ORP, mV, Conductivity, TDS, Salinity, Temp $393.75

Myron TDS / Conductivity / Salinity Pocket Pen Meter $185.95

Extech EC400 ExStik® Conductivity/TDS/Salinity Meter $89.99

Extech Instruments 341350A-P pH/Conductivity/TDS/ORP/Salinity Meter Oyster Serie $299.95

Digital Conductivity Tester Meter Hydroponics Salinity $17.99

VWR Digital Conductivity Bench Meter resistivity salinity concentration T.D.S pp $175.00

** NEW Complete Conductivity / TDS / Salinity KIT ** $69.00

Orion 115 portable Conductivity Salinity TDS meter kit + 011510 graphite probe! $533.78

NEW! YSI 63 pH, Conductivity, Salinity, Temp. Meter $1,025.00

NEW! YSI Model 30 Salinity, Conductivity, Temp. Meter $680.00

SALINITY INDICATOR (CONDUCTIVITY METER) SK101 $300.00

Thermo Orion 145 benchtop (pure water) Conductivity/Salinity/TDS meter kit NEW $854.69

Conductivity – TDS – Salinity Benchtop Meter $299.25

YSI 3100 Conductivity Salinity Temp benchtop instrument meter kit + 3401 probe! $747.72

Extech 341350A-P Oyster Series pH/Conductivity/TDS/ORP/Salinity Meter $399.99

Meter – pH, ORP, mV, Conductivity, TDS, Salinity, Temp $359.99

TDS. Salinity, Conductivity Meter Sper Scientific-85038 $278.25

Extech 341350A-P Oyster Series pH/Conductivity/TDS/ORP/Salinity Meter $399.99

VSI Model 33 SCT Salinity conductivity temperature Meter $79.99

SGS Instruments Salinity-Conductivity-Temperature-TDS Meter New Made In USA $149.00

NEW! YSI Pro 2030 DO, Conductivity, Salinity Meter $1,300.00

Aquatronica Low Range Salinity / Density Conductivity Interface $59.99 This item has free shipping. In order to keep your aquarium in balance, you must monitor the conductivity range closely. The Aquatronica Low Range Conductivity Interface measures and controls the conductivity value in soft water when attached to the Aquatronica Low Range Conductivity electrode (sold separately). These devices are designed to connect to the Aquatronica Aquarium Control System.

Aquatronica High Range Salinity / Density Conductivity Interface $59.99 This item has free shipping. In order to keep your aquarium in balance, you must monitor the conductivity range closely. The Aquatronica High Range Conductivity Interface measures and controls the conductivity value in salt water when you attached to the Aquatronica High Range Conductivity electrode (sold separately). These devices are designed to connect to the Aquatronica Aquarium Control System.

VWR Replacement Probe for Digital Conductivity Bench Meter $234.96 VWR Replacement Probe for Digital Conductivity Bench Meter

Salinity Calibration Fluid – 53.0 mS $8.99 Insure a perfect reading with your American Marine Salinity Meter- This salinity calibration fluid sets your system at the precise reading you need. 53.0mS

Digital Aquatics Salinity Probe $119.99 Digital Aquatics conductivity/salinity probe has a rugges design, allowing for good water flow past the electrode and easy cleaning. This probe is equipped with the ability to provide full temperature compensation, resulting in superior monitoring over a range of applications. Requires the SL2 module which has the salinity port for the probe. Both the ReefKeeper Elite and ReefKeeper Lite can interface with this probe. Item is dropshipped from the manufacturer. Please call 1-888-842-8738 to determine shipping costs.

Hand Held TDS Conductivity Meter $74.99 Trust nothing less than precision when it comes to testing electrical conductivity, TDS and temperature in your aquarium. Spectrapure’s handheld meter is the only one available true to the curved scale, as opposed to a linear factor. The temperature compensation coefficients are also matched to the respective scales ensuring greater precision. Each meter can be calibrated digitally to any known value, unlike most testing devices which can only be calibrated to a few. Other features include: Resolution down to 0.1 micro S On-screen temperature display in Celsius or Fahrenheit Auto ranging 0-9990 micro S, 0-8560 ppm Detachable platinum electrodes Low battery indicator Waterproof and floats Uses three 1.5V button cell batteries (included) Includes lanyard and user’s guide

VWR Digital Conductivity Bench Meter $1357.03 VWR Digital Conductivity Bench Meter Traceable. VWR One-Year Limited Warranty. Product Includes: Supplied with glass probe, 115V AC adapter, 9V battery, receptacle to supply probe replatinizing current, and probe holder arm. Features of Bench Meter: Designed to measure conductivity in water analysis, biotechnology, life sciences, environmental studies, and more. Can also be used to check water purity in stills and demineralizers, test laboratory glassware, measure total dissolved solids, and make up solutions. Accurately provides results in conductivity (micromhos/cm and microsiemens/cm), resistivity (megohms), and dissolved solids (parts per million). Large, 4-digit, 12.7mm (1/2″) LCD shows temperature in °C and °F. Instant-response probe contains platinum electrodes and a solid-state thermometer for automatic/manual temperature compensation. All readings are referenced to the international standard of 25°C. Computer RS-232 output and recorder jack allows for continuous monitoring and a permanent record. Unit has keys to calibrate to four different calibration points. Chemical-resistant ABS housing withstands harsh environments. Meets all accreditation requirements and U.S. Government specifications. Measures reagent-grade water for CAP, ASTM, NCCLS, and ACS. A serial numbered certificate is provided from an ISO 17025 calibration laboratory to indicate instrument traceability to standards provided by the National Institute of Standards and Technology. Product Specifications: Range (�siemens): 0.01 to 20.00, 0.1 to 200, 1 to 2000, 10 to 20,000, 100 to 200,000. Range (megohms): 0.001 to 2.00 0.01 to 20.00. Range Dissolved Solids (ppm): 0.1 to 20.00; 1 to 200; 10 to 2000, 100 to 20,000. Temperature Range: —30 to 130°C (—34 to 266°F). Accuracy: 0.3%. Probe Length: 15.24 cm (6″) Diameter: 1.27 cm (1/2″). Dimensions: 6 x 8 1/4 x 3 1/2″ (15.24L x 20.95H x 8.89D cm). Weight: 0.68 kg (1.5 lbs.).

Vernier Conductivity Probe $110.99 Conductivity Probe (For LabQuest, LabPro, Go! Link, CBL 2, and CBL)…This probe is great for environmental testing for salinity, total dissolved solids (TDS), or conductivity in water samples. Biology teachers can use this probe to demonstrate diffusion of ions through membranes or to monitor changes in ion levels in aquatic systems. Chemistry students can use it to investigate the difference between ionic and molecular compounds, strong and weak acids, or ionic compounds that yield different ratios of ions. The Conductivity Probe can monitor concentration or conductivity at three different sensitivity settings.

1413 us-cm Conductivity Solution – 220 mL $8.99 Conductivity Solution for the Milwaukee Conductivity Meter. Callibrates meter to read up to 1413 us/cm.

Koi Medic Salinity Meter Pen $97.19 Quickly and accurately measures salt concentration in koi ponds. Salt deters algae growth, detoxifies nitrite, eliminates fish parasites and bacterial infections. Extremely accurate and easy to use; simply turn it on and dip it in the pond. Within two seconds, the LCD displays the salt concentration percentages. Also ideal for checking salt in fish hospital tanks and tropical aquariums. One year manufacturer’ warranty.

Bluelab Combo Conductivity, pH, Temperature Meter: J $254.96 The Bluelab Combo Meter is a conductivity, pH and temperature meter all in one. It comes with a pH probe and conductivity and temperature probe, which are simply placed into the solution and the selected reading is displayed on screen. As the Bluelab Combo Meter is portable and does not require a power supply to operate, it can be used anytime and anywhere to help you manage your crops daily nutrient requirements. Calibration of the pH is very easy, using the push buttons on the meter and fresh Bluelab calibration solutions. Conductivity and temperature do not need to be calibrated as this is locked in during manufacture. The Bluelab Combo Meter gives you the added benefit of being able to select the display options for °C or °F and EC, CF or ppm. Light weight and portable Measures pH, Nutrient and Temperature Three display options for Nutrient – EC, CF, ppm (500 scale) Two display options for Temperature (°C or °F) Three calibration points, 4, 7 and 10pH Temperature at a push of a button Simple push button pH calibration Auto turn off Function Large 13mm(1/2") digital display for easy reading Supplied with quality probes and pH calibration solutions Low battery indicator Long life 3 AAA batteries 5 year Bluelab Guarantee (6 mo for pH probe)

Thermo Fischer Orion 3-Star Plus Conductivity Benchtop Meter Kit $1323 Features of the Thermo Fischer Orion 3-Star Plus Conductivity Benchtop Meter Kit: Meter Kit package includes meter, DuraProbe* conductivity cell 013005MD, 5 x 60mL of 1413µS/cm conductivity/TDS standard 011007, electrode stand, universal power supply and instructions. Easy-to-use single-channel meter with improved stability algorithm to increase calibration and measurement accuracy. Ideal meter to help meet USP requirements. Bright, backlit LCD display with ready indication Simultaneous display of conductivity and temperature Convenient built-in Quick-Start Guide with calibration instructions Stores, displays and prints up to 10 methods with individual method password protection Automatic or manual temperature compensation Auto-read/hold function Capable of operating an autosampler and stirrer probe (both sold separately) IP54 dustproof and splashproof

Fisher Scientific Accumet AP75 Portable Waterproof Conductivity/TDS Meter $663 Features of the Fisher Scientific Accumet AP75 Portable Waterproof Conductivity/TDS Meter: Rugged waterproof and dustproof meter floats and withstands rough conditions existing in the field or industrial settings. Dual-display LCD shows conductivity or TDS plus temperature in °C or °F. Meter switches between readings with the press of a button. Advanced features for easy customization. Includes: Meter/Probe package includes meter, K = 1.0cm-1 conductivity/temperature plastic-bodied probe with 3 ft. (0.9m) long cable (13-620-AP54), four “AAA” batteries, and instruction manual. Selectable cell constant (0.1cm-1, 1.0cm-1, or 10cm-1). Autoranges for conductivity across five ranges and TDS across six for fast response. Calibration up to five points for both conductivity and TDS measurements. Adjustable temperature coefficient from 0 to 10% per °C offers accurate compensation in almost any solution. Selectable auto endpoint freezes reading immediately after meter indicates stabilization. Expanded memory function stores and recalls up to 50 readings. Real-time clock enables stored and calibration data to be combined with date and time for more complete recordkeeping. HOLD function and auto shutoff. Dimensions: 7.5L x 3.75W x 2.25 in.H (19 x 9.5 x 5.7cm). Conductivity Mode: * Range: 0.00 to 19.99?S, 0.0 to 199.9?S, 0 to 1999?S, 0.00 to 19.99mS, 0.0 to 199.9ms * Resolution: 0.01?S, 0.1?S, 1?S, 0.01mS, 0.1mS * Accuracy: ±1% of FS * Cell Constants: 0.1cm-1, 1.0cm-1, 10cm-1 TDS Mode: * TDS Mode: 0.00 to 9.99ppm, 10.0 to 99.9ppm, 100 to 999ppm, 1.00 to 9.99ppt, 10.0 to 99.9ppt, 100 to 200ppt * Resolution: 0.01ppm, 0.1ppm, 1ppm, 0.01ppt, 0.1ppt, 1ppt * Accuracy: ±1% of FS Temperature Mode: * Range: 0° to 100°C (32° to 212°F) * Resolution: 0.1°C/0.1°F * Accuracy: ±0.5°C/0.5°F * Compensation: Manual or Automatic

Salinity $588.99 This book is in Acceptable condition

Agricultural Salinity Assessment and Management $134.4 Agricultural Salinity Assessment and Management

Plant Growth, Drought and Salinity $18.63 Plant Growth, Drought and Salinity

The Development of the Chlorinity/ Salinity Concept in Oceanography $272 The Development of the Chlorinity/ Salinity Concept in Oceanography

Meter $6 Meter

Handbook of Thermal Conductivity $109.76 Handbook of Thermal Conductivity

Pinpoint Salinity Monitor $148.99 You’ll always know the exact salinity of your aquarium with the Pinpoint Salinity Monitor. Quickly and accurately measures the amount of salt in your saltwater aquarium and displays a digital reading. This monitor is temperature compensating and referenced to both % salt and specific gravity methods.

Temperature-Salinity Analysis of World Ocean Waters $272 Temperature-Salinity Analysis of World Ocean Waters

EC Dipstick Meter: HY $66.3 EC Dipstick (formerly Nutrawand) by Control Wizard Products.New Name! New Label! Same Easy to Use Meter! Now with the 4 most popular scales: EC, CF, 500:1ppm, and 700:1ppm! No matter what meters you have used in the past, the EC Dipstick can read just like it. EC Dipstick (formerly Nutrawand) by Control Wizard Products dissolved salts pen, measures conductivity in both PPM, EC and CF. No calibration required, auto on/off. Very Nice!Over the years Control Wizard Products' EC Dipstick (formerly Nutrawand) has proven to be a rugged performer and great conductivity meter that everyone that owns one seems to love. Why, well they just seem to work harder the more demanding the situation. It's great for greenhouse use where high moisture situations exist or in classrooms where students are learning how to care for tools. The meter is waterproof to 1 meter for short periods of time. Its new electronics allow for hassle free operation. It does not require calibration like other meters. Calibration is all handled internally within its electronic brain. Each time you replace batteries it recalibrates itself. Wow, how cool is that? The savings in calibration solution over 5 years alone makes this meter a real buy. It measures conductivity in 4 scales: EC, CF and 2 PPM scales. EC stands for electrical conductivity, PPM stands for parts per million and CF stands for conductivity factor. Conductivity factor is simply ten times the EC reading for easy reference (1.5 EC reads 15 CF). Another feature that's a real advantage is with just a glance, the EC Dipstick allows you to easily read all scales at once. Well-placed blinking LED lights show you the conductivity of your nutrient from a brightly printed scale. This is one instance that new technology has actually made the product easier and more fun to use instead of hideously more complicated and time consuming. Want icing on your cake? This meter uses three inexpensive AA flashlight batteries. This meters worthiness should be a no-brainer for all growers young and old. This meter comes with a limited two-year warranty with your original sales receipt.

1500 ppM Calibration Solution for EC and PPM Conductivity Meters, 8 fl oz: J $6.97 pH 4.01 CALIBRATION SOLUTION This standard reference solution is for the calibration of pH meters. pH 7.0 CALIBRATION SOLUTION This solution is for calibration of pH meters and electrode storage. 1500ppm CALIBRATION SOLUTION For the calibration of EC and PPM conductivity meters. General Hydroponics uses the highest quality reference solutions, allowing growers to calibrate many popular brands of PH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics technicians check each batch to ensure that our solutions are precisely calibrated and yield reliable readings each time they are used. How do I use Standard Reference Solutions? Pour in enough Standard Reverence Solution to submerse a meter probe’s tip. Turn on meter and adjust accordingly to calibrate meter. When do I use theStandard Reference Solutions? Use the Standard Reference Solutions any time calibration is required (at least once per month).. What will theStandard Reference Solutions? Confirming that meters are properly calibrated will assure that nutrients and pH are maintained at the desired levels. Where will I see the results? Plants grown in a solution with proper pH and ppm will be free of nutrient deficiency problems when using quality nutrients in a well-maintained system. Why should I use theStandard Reference Solutions? GH Standard Reference Solutions meet rigorous quality standards to ensure that meters are correctly calibrated.

EC Shake Nutrient Meter: J $74.76 This revolutionary EC meter is powered by a magnet instead of a battery! A gentle shaking action generates the energy to power this simple, yet sophisticated meter. With just a few easy steps you will get a quick & accurate reading of the electrical conductivity (EC) of your nutrient solution. This patented meter will completely simplify your growing experience and success. Green LED display. No batteries required. Factory calibrated. Automatic temperature compensation. Automatic on/off function. Waterproof. 1 year warranty.

Salinity Refractometer MR100ATC: J $91.36 The MR series refractometers are precision optical instruments used for measuring concentrations of substances in aqueous solutions. The instrument measures the refractive index of the sample and displays the result in parts per thousand ( 0/00 ) and specific gravity. They work using the principle of light refraction trough liquids. When passing light trough a liquid the refracted angle will be shown on the scale determining the amount of dissolved solids in the liquid. Simply place one drop of your sample on the prism and read the results on the scales immediately! For sea water density with ATC. Range: 0-100% salinity, 1.000-1.070 (specific gravity), resolution 1% salinity, 0.001 (specific gravity). Scale Range Resolution Parts Per Thousand 0 to 100 0/00 1 0/00 Specific Gravity 1.000 to 1.070 Dimensions 7.6 x 1.5 x 1.5” (194 x 38 x 38mm) Weight Approx. 8.0 oz. (227g)