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At AquaCave, we offer some of the best selection & best prices on aquarium water quality monitors, testers, controllers , and accessories for you marine, reef, and freshwater aquarium.
Taking the time to test your aquarium water whether it is a freshwater or saltwater tank system is a very important part of maintenance, as it gives you an analysis of the condition or quality of the environment your tank inhabitants are living in. By testing the basic water parameters and various chemical elements such as ammonia, nitrate, nitrate, pH and other testable parameters regularly, you stay on top of what is happening in your system at all times. It also helps you diagnose any potential problem that may be arising, which allows you to prevent it from advancing or taking hold in the first place.
From pH and ORP meters and controllers, dissolved oxygen testers and refractometers to professional quality meters and colorimeters, you'll find it here at the great price

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Milwaukee Portable Meters
- AG900 Agricultural Test Kit by Milwaukee Instruments : No need to wait weeks for a soil test. Instantly, in the field, verify your soil condition and needs as well as your fertilizer application accuracy.
- SM101 pH Meter by Milwaukee Instruments : SM101 is a Portable pH meter with testing range of 0.00 - 14.00 pH
- SM102 pH Meter with ATC by Milwaukee Instruments : SM102 is a Portable pH meter with temperature compensation.
- SM301 Conductivity Meter by Milwaukee Instruments : SM301 is a Portable conductivity meter with range of 0 – 1990 µS/cm.
- SM401 TDS Meter by Milwaukee Instruments : SM401 ia a Portable TDS (total dissolved solids) meter with range of 10 – 1990 ppm.
- SM500 ORP Meter by Milwaukee Instruments : SM500 is a Portable ORP meter with range of ± 1000mV.
- SM600 Dissolved Oxygen Meter by Milwaukee Instruments : SM600 is a Portable DO ( Dissolved Oxygen ) meter with range of 0.0 - 19.9 ppm.
- SM700 LUX Light Meter by Milwaukee Instruments : Portable Light meter with waterproof probe. Great for testing underwater light intensity in your aquarium.
- SM802 pH/EC/TDS Meter by Milwaukee Instruments : SM802 is a Portable multi meter capable of tasting pH, EC and TDS with a single electrode. Great for aquarium, aquaculture, and horticulture applications.

Milwaukee Controllers
- SMS122 pH Controller by Milwaukee Instruments : SMS122 ia a Professional pH/CO2 controller especially designed for use in aquariums.
- SMS125 pH/ORP Controller by Milwaukee Instruments : With Milwaukee's SMS125 Smart controller you can monitor and control pH and/or ORP levels directly in your aquarium.
- SMS510 ORP Controller by Milwaukee Instruments : With Milwaukee's SMS510 Smart controller you can monitor and control ORP levels directly in your aquarium.

Milwaukee Monitors
- SMS115 Cal-Test pH Monitor by Milwaukee Instruments : SMS115 is a Smart pH monitor with Cal-test function. The Cal-test button will show you when to calibrate your instrument.
- SMS315 Cal-Test EC Monitor by Milwaukee Instruments : SMS315 is a Smart EC monitor with Cal-test function. The Cal-test button will show you when to calibrate your instrument.
- SMS415 Cal-Test TDS Monitor by Milwaukee Instruments : SMS415 is a Smart TDS monitor with Cal-test function. The Cal-test button will show you when to calibrate your instrument.
- SMS120 pH Monitor by Milwaukee Instruments : Milwaukee’s SMS120 pH monitor is low cost durable monitor for quick and reliable continuous pH measurements.

AquaMedic Controllers

- mV Computer by AquaMedic : ORP (Oxygen Reduction Potential) is not an easy water quality parameter to fully understand. Fortunately you need to know little more than that it is measured in mV and that it will be the measure by which we switch Ozone Generators and the pumps that regulate Nitratereductors.
The Aqua MedicmV Controllers and mV Computers are outstanding instruments to accurately monitor milli-volts and switch a powered outlet in order to achieve the set potential.
The mV Computer is a microprocessor run mV monitor and controller that provides high precision measurement and control.
The waterproof proof front panel includes soft touch keys to set the operating values and to calibrate the electrode. The switching bandwidth (hysteresis) is adjustable over a wide range to define the amount of mV drift allowed before switching. With the mV Computer you can set the control direction up or down, in low mode the controller can activate an Ozone Generator to boost skimmer production and to maintain an appropriately high system redox-potential, to control the flow rate through a Nitratereductor to retain anoxic conditions ideal for denitrification.
The high mode function allows for reducing additions.
The Aqua Medic mV Computer includes an electrode (78005, High Pressure, Threaded), and a complete set of calibration fluids.


- mV Controller by AquaMedic (DICSONTINUED): The mV Controller is designed for monitoring and controlling the redox-potential (or ORP, oxidation-reduction-potential) in aquaria.
The unit has a broad controlling range from a -500 to a +500 mV and a measuring range from -1000 to +1000 mV. It can be used to control the supply of ozone in salt water aquaria and/or for the control of the nitrate removal in anaerobic biological filters (Aqua Medic Nitratereductor).
The unit is supplied with a BNC connection for the mV probe. The use of an original Aqua Medic plastic shafted electrode is recommended.
Redox-potential (ORP) monitor and controller.

Optional AquaMedic Electrodes:
- AquaMedic mV Electrode AM78007 (low pressure)
- AquaMedic mV Electrode AM78005 (high pressure / screw type)

- pH Computer by AquaMedic : In today’s advanced aquarium hobby we have access to some wonderful tools meant to automate and regulate some complex aspects of our water chemistry.
Two such tools are CO2 Reactors to maintain optimum pH values and to source the precious carbon dioxide for proper live plant respiration and Calcium reactors where CO2 gas is used to drop the pH inside the reaction chamber in order to dissolve the Hydro carbonate media.
A critical aspect common to both of these tools is that the amount of CO2 dosed is determined by the desired pH. The use of an M-Ventil solenoid valve, plugged into a pH Computer, allows the CO2 input to be switched on and off automatically to achieve the desired pH value.
The pH Computer is a microprocessor run pH monitor and controller that provides high precision measurement and control. The waterproof proof front panel includes soft touch keys to set the operating values and to calibrate the electrode.
The switching bandwidth (hysteresis) is adjustable over a wide range to define the amount of pH drift allowed before switching. With the pH Computer you can set the control direction up or down, allowing you to use the computer in High Mode to activate a pump dosing Kalkwasser to maintain a high pH, or in Low Mode for dosing CO2 to maintain a low pH.
The Aqua Medic pH Computer includes an electrode (AM78006, high pressure, threaded) and a complete set of calibration fluids.
Calibration is easier too, simply submerge the electrode in the calibration solution and push the corresponding CAL button. The pH Computer automatically calibrates itself to the solution.

- pH Controller by AquaMedic (DISCONTINUED) : AquaMedic's pH controller is a precision instrument to control the pH value in aquaria. In combination with a CO2 system and a solenoid valve, the pH can be maintained at a constant level, and the CO2 supply to aquatic plants or into a Calcium Reactor can be controlled.
The unit is supplied with a large LED display and the control range is digitally adjustable from pH 3.5 to 10.5.
The pH controller has a BNC connection for pH electrodes. The use of an original Aqua Medic plastic shafted electrode is recommended.

Optional AquaMedic Electrodes:
- AquaMedic pH Electrode AM78002 (low pressure)
- AquaMedic pH Electrode AM78006 (high pressure / screw type)

Pinpoint Monitors by American Marine
- Pinpoint Calcium Monitor by American Marine : The PINPOINT Calcium Monitor™ is the only truly affordable and accurate digital Calcium measurement instrument for marine saltwater.
Powered by a 9-volt battery (not included), the PINPOINT Calcium Monitor™ will operate for approximately 150 total hours before battery replacement is visually indicated on the display.
The PINPOINT Calcium Monitor™ comes complete with Calcium Meter, Calcium Selective Probe and Calibration/probe fluids.
* Given proper care, the PINPOINT Calcium Monitor™ should last a lifetime.
* PINPOINT Calcium Probe comes with a 10 foot high supression cable and a BNC connector.
* Powered by a standard 9-volt battery (not included).
- Pinpoint Nitrate Monitor by American Marine : American Marine is proud to introduce the PINPOINT™ Nitrate Monitor. The only truly affordable and accurate digital Nitrate measurement instrument engineered for marine saltwater.
The PINPOINT™ Nitrate Monitor has been designed as a precision spot-testing instrument.
There are 2 independent measurement ranges: Low Range is 1–10 ppm nitrate and High Range is 10–100 ppm nitrate. Resolution is 1 ppm in either scale.
Accuracy is 1 ppm after calibration.
The PINPOINT Nitrate Monitor is sold complete with meter, probe and all calibration fluids (9 volt battery not included).
* Given proper care, the PINPOINT Nitrate Monitor™ should last a lifetime.
* Powered by a standard 9-volt battery (not included).
- Pinpoint Conductivity Monitor by American Marine : PINPOINT Conductivity Monitor™ is an instrument for the measurement of hardness in freshwater. The conversions are 33 µS=17.9 ppm=1dH.
Good quality reverse osmosis water measures 5–15 µS, while de-ionized water typically measures 0–1 µS.
The Conductivity Monitor is automatically temperature-compensated and has two ranges, making it useful several different applications. Both freshwater fish keepers and those who use deionized/reverse osmosis systems often rely heavily on this meter.
The freshwater hobbyist will appreciate the instant readings for precise hardness. The saltwater hobbyist will use the PINPOINT Conductivity Monitor™ to assess the purity of deionized and reverse osmosis water.
* Given proper care, the PINPOINT Conductivity Monitor™ should last a lifetime.
* PINPOINT Conductivity Probe is permanent and may never require replacement.
* Powered by a standard 9-volt battery (not included).
- Pinpoint ORP Monitor by American Marine : PINPOINT ORP Monitor™ will measure the ORP (oxidation-reduction potential, or REDOX) of your system. It is popular with those who use ozone gas or potassium permanganate as an artificial oxidation agent in fresh or saltwater.
It is also popular for measurement of hydrogen rich water. Constant monitoring of the ORP is useful in keeping tabs on the overall health of a system, as a drop in ORP often precedes visual or other indications of trouble.
This unit features a 1mV digital resolution and a platinum sensor electrode.
This is a full range REDOX/ORP instrument (–2000 to +2000 mV)
* Given proper care, the PINPOINT ORP Monitor™ should last a lifetime.
* PINPOINT ORP Probe comes with a 10 foot high supression cable and a BNC connector.
* The range is –2000 to +2000 mV.
* Powered by a standard 9-volt battery (not included).
- Pinpoint pH Monitor by American Marine : The PINPOINT pH Monitor™ is in use by thousands of customers worldwide. This affordable unit remains the only full-time pH monitor with .01 resolution.
The PINPOINT pH Monitor™ is sold complete with probe and calibration fluids (9 volt battery not included).
The electrode is also available separately and fits any meter, monitor or computer controller.
* Given proper care, the PINPOINT pH Monitor™ should last a lifetime.
* PINPOINT pH Probe comes with a 10 foot high supression cable and a BNC connector.
* Powered by a standard 9-volt battery (not included).
- Pinpoint Salinity Monitor by American Marine : PINPOINT Salinity Monitor™ will accurately and immediately measure the amount of salt in any marine or freshwater system.
The reading is fully temperature compensated, which is difficult or impossible with nearly any commercial hydrometer.
The conversion chart will precisely show the corresponding density (specific gravity) or % salt (refractometer) values.
This monitor is especially useful to determine the low level of salt required for Koi, whether in an aquarium or outdoor pond.
* Given proper care, the PINPOINT Salinity Monitor™ should last a lifetime.
* Powered by a standard 9-volt battery (not included).
- Pinpoint Wireless Digital Thermometer : Utilizing a radio wave signal, the remote sensor(s) will measure the temperature at the waterproof probe tip and send the information to the PINPOINT Temperature Display Monitor, which will display the temperature in Fº or Cº degrees.
The Pinpoint Wireless Thermometer can accept a maximum of 4 remote sensors, thus expanding the monitoring capability to 4 different locations to be displayed on the same Pinpoint Temperature Display Monitor.
Given proper care, the Pinpoint Wireless Thermometer should last a lifetime.
Remote sensors can transmit temperature signals as far as 100 feet (30 Meters) in optimum conditions.
The monitor and remote sensor are powered by two AAA batteries each.
Monitor accepts up to four remote temperature sensors.

Pinpoint Controllers by American Marine

- Pinpoint ORP Controller by American Marine : PINPOINT ORP (REDOX) Controller™ is an inexpensive rugged controller complete with a platinum ORP probe. This device will automate another electrical device like an ozonizer or ozone generator.
This full featured controller will accommodate an electrical device up to 5.0 amps at 110VAC. A 220VAC version is also available.
* The PINPOINT ORP Controller™ is the perfect way to automate ozone in the aquarium.
GENERAL SPECIFICATIONS
* pORP Measurement Range –1,999 to +1,999 mV
* ORP Setpoint Range 0 to 1,000 mV
* 3 1/2 Digit LCD Display
* Resolution 1 mV Unit
* 2 Independent 5 Amp (110 VAC) Relay Outputs

- Pinpoint pH Controller by American Marine : PINPOINT pH Controller™ is an inexpensive yet rugged controller, which includes the appropriate probe and calibration fluids.
This device will automate another electrical device such as a calcium reactor or magnetic solenoid for the addition of CO2 into an aquaculture or process system, and will control pH in both a downward and upward direction.
The user will select his or her own setpoint and any range of acceptable pH around this setpoint. This full featured controller will handle up to 5.0 amps at 110VAC. A 220VAC version is also available.
* The PINPOINT pH Controller™ is perfect for the freshwater planted aquarium keeper as well as the serious saltwater hobbyist.
* Excellent for Calcium Reactor Setups.
GENERAL SPECIFICATIONS
* pH Measurement Range 1.00 – 14.00
* pH Setpoint Range 4.00 – 10.00
* 3 1/2 Digit LCD Display
* Resolution 00.00 pH Unit
* 2 Independent 5 Amp 110 VAC Relay Outputs

- Pinpoint Temperature Controller by American Marine : PINPOINT Temperature Controller™ is an inexpensive but rugged controller that can be used for a chiller or a heater; or both a chiller and a heater.
Fully programmable setpoints. Farenheit only readout and resolution to 1/10 of a degree, e.g. 78.6 F, make this an easy choice for larger reef systems. Available 110VAC only.
* The PINPOINT Temperature Controller™ is the perfect way to regulate temperature in the aquarium.
* 110 VAC operation.
* Never needs calibration.
GENERAL SPECIFICATIONS
* Temperature Measurement Range 32.0° F – 212.0° F
* Temperature Control Range 60.0° F – 102.0° F
* Differential Minimum ±0.5° F of a selected temperature
* Differential Maximum ±10.0° F of a selected temperature
* 3 1/2 Digit LCD Display
* Resolution: 000.0° Fahrenheit Degree
* 2 Independent 12 Amp 110 VAC Relay Outputs

Milwaukee Testers
- C-64 Conductivity Tester by Milwaukee Instruments : Easy to use, pocket conductivity tester from Milwaukee Instruments. Microprocessor based tester features a clog-resistant cloth junction electrode designed specifically for the aquarium market.
- C-66 Waterproof Conductivity Tester by Milwaukee Instruments : These instruments are designed for heavy duty applications. All testers have waterproof casing and modular design that allows easy electrode and battery replacement.
- PH-51 Waterproof pH Tester by Milwaukee Instruments : These instruments are designed for heavy duty applications. All testers have waterproof casing, double junction replaceable glass electrode (for PH51) and modular design that allows easy electrode and battery replacement.
- PH-600 pH Tester by Milwaukee Instruments : Milwaukee's economical testers are easy-to-use and low cost instruments to measure quick and reliable pH.
- T-74 TDS Tester by Milwaukee Instruments : Easy to use, pocket TDS tester from Milwaukee Instruments. Microprocessor based tester features a clog-resistant cloth junction electrode designed specifically for the aquarium market.

Martini Professional Colorimeters
- MI-404 Free & Total Chlorine Colorimeter by Martini
- MI-405 Ammonia Colorimeter Mid Range by Martini
- MI-406 Free Chlorine Colorimeter by Martini
- MI-407 Ammonia Colorimeter Low Range by Martini
- MI-408 Iron Colorimeter High Range by Martini
- MI-411 pH; Free & Total Chlorine Colorimeter by Martini
- MI-412 Phosphate Colorimeter Low Range by Martini
- MI-413 Free & Total Chlorine Colorimeter, High Range by Martini
- MI-414 Chloride Colorimeter by Martini

Martini Professional Meters
- MI-105 pH / Temperature Meter by Martini Instruments
- MI-106 pH/ORP/Temp. Meter Extended Range by Martini Instruments
- MI-605 Oxygen Meter by Martini Instruments
- MI-805 pH/EC/TDS and Temperature Meter by Martini Instruments
- MI-806 pH/EC/TDS and Temp. Meter, Multi-range by Martini Instruments

Salinity Refractometers
- Salinity Refractometer with ATC by Milwaukee Instruments : The MR series refractometers are precision optical instruments used for measuring aquarium water salinity.
They work using principle of light refraction through liquid. When passing light through a liquid the refracted angle will be shown on the scale determining the amount of salt in the water.
- Salinity Refractometer with ATC by AquaMedic : This high-quality refractometer reads in both salinity and specific gravity values that are temperature compensated and can be easily calibrated with a drop of freshwater.

Calibration Solutions

Reagents for Martini Colorimeters

Replacement Probes & Accessories
- Milwaukee Replacement Probes & Accessories
- Martini Replacement Electrodes & Accessories
- AquaMedic Electrodes

Electrode Holder by AquaMedic : The Aqua Medic Electrode Probe Holder can mount to a vertical or a horizontal lip, and accepts up to 4 probes.



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