Nothing matches all of those filters.
pH up, pH down and conditioners
Moving the tank into range, and holding it there once it is.
Cal-Mag and calcium supplements
What soft water and reverse osmosis water leave out.
Meters, dosers and controllers
Reading pH and EC, and in the case of the controllers, correcting them for you.
pH Test Kit – Drop Test Reagent for Nutrient Solution
- Brand Hydro Crop Shop
- Type Meters
- Price from £4.95
- Availability In stock
Bluelab pH Controller Power Supply – Replacement Adaptor
- Brand Bluelab
- Part pH Controller and Pro Controller power supply (Bl...
- Compatible with Bluelab pH Controller, pH Controller Wi-Fi and Pr...
- Output 24 V DC, 0.31 A (Bluelab)
- Plug adaptors UK, Europe, North America, Australia/New Zealand
- Input 100–240 V AC, 50–60 Hz
Bluelab PeriPod M4 – 4-Pump Automatic Nutrient Doser
- Pumps 4 x peristaltic, up to 120 ml/min (4 fl oz/min) each
- Flow-rate accuracy ±10% before pump calibration
- Default pump roles pump 1 pH, pumps 2–4 nutrient A, B and C (all rea...
- Linking up to three M-series PeriPods (M3 or M4), maximum...
- Controller Bluelab Pro Controller Wi-Fi, or the earlier Blue...
- Tubing supplied 4 m acid/alkali-resistant pH tubing; 3 x 4 m opaq...
- Acid limits below 80% phosphoric, 35% nitric, 30% sulphuric o...
- Service life peristaltic tubing more than 750 hours of pump ru...
- Operating temperature 5–40 °C solution and room
- Power 100–240 V AC in; 24 V DC 2 A power supply included
- Size about 285 mm wide (PeriPod M3
- In the box PeriPod M4, power supply, dosing cable, pH tubing...
- Certifications CE, FCC, IC
- Warranty 2 years (6 months on cassettes and tubing)
- Bluelab part code PERIPODM4
Bluelab Pump Cassette Small/Medium – For PeriPod M3 & M4
- Part Bluelab Replacement Pump Cassette Small/Medium (B...
- Contains rollers and internal peristaltic tubing in one unit
- Pump size Bluelab 10–120 ml/min pumps only
- Compatible with Bluelab PeriPod M3, PeriPod M4, pH Controller, pH...
- Not compatible with PeriPod L3 (uses the L-series cassette)
- Peristaltic tube life more than 750 hours of pump running time (Bluelab...
- Motor not included – the cassette fits the existing dri...
Out of stock
VIVOSUN pH and TDS Meter Combo – Hydroponic Water Test Kit
- pH range 0.00–14.00, ±0.1 pH
- TDS range 0–9999 ppm, 1 ppm resolution, ±5%
- EC range 0–9999 µS/cm, 1 µS/cm resolution, ±5%
- Temperature 0.1–80°C (32–176°F), 0.1° resolution
- Compensation ATC on both pens
- TDS pen power 1 × 3V CR2032 button cell
- In the box pH pen, TDS/EC/temperature pen, pH buffer powders
Milwaukee EC40 Nutrient Truncheon – EC Meter for Hydroponics
- Model Milwaukee EC40 EC/TDS Nutrient Meter
- Range 0.2 to 4.0 mS/cm | 2 to 40 CF | 100 to 2000 ppm (...
- Resolution 0.1 mS/cm (70 ppm on the 700 scale, 50 ppm on the...
- Accuracy ±4% of reading ±1 resolution point
- Calibration factory calibrated
- Temperature compensation automatic, 5 to 50 °C
- Display 20 blue LED bar
- Probe graphite EC sensor with built-in temperature sensor
- Protection IP67 waterproof, floating
- Power 3 x 1.5V AA alkaline (included); auto on/off; bat...
- Dimensions 420mm long x 30mm diameter; 255g with batteries
- Supplied with wrist strap
Essentials EC Meter – Nutrient Meter for Hydroponics
- Range 0.1 – 10.0 mS
- Resolution 0.1 mS
- Accuracy ±2% full scale
- Temperature compensation automatic, 0°C – 70°C
- Operating temperature 0°C – 50°C
- Memory 10 readings
- Battery 4 x 1.5V button cells, approx. 100 hours
- Auto shut-off approx. 15 minutes
- Dimensions 170 x 32 x 15mm
- Weight approx. 70g
Bluelab External Lockout and Alarm Box – Float Switch Alarm
- Brand Bluelab
- Model External Lockout and Alarm Box (PROEXBOX)
- Compatible with Bluelab Pro Controller and Pro Controller Wi-Fi
- Inputs external lockout switches, normally open or norma...
- Output external alarm (horn or flashing light, not inclu...
- Function inhibits all Pro Controller dosing until reset
Bluelab PeriPod L3 – Nutrient Doser for Hydroponics
- Brand Bluelab
- Model PeriPod L3 (PERIPODL3)
- Pumps 3 peristaltic pumps
- Flow rate up to 1200ml/min per pump, accuracy ±10% at 25°C
- Compatible with Bluelab Pro Controller Wi-Fi (and the discontinue...
- Linking L3 to L3 only, maximum 12 pumps
- Tubing supplied 4 m acid/alkaline-resistant pH tubing and 3 x 4 m...
- Solution and room temperature 5-40°C
- Acid limits under 80% phosphoric, 35% nitric, 30% sulphuric o...
- Warranty 2 years (6 months on cassettes and tubing)
- Power supply 24 V DC 2 A adaptor, 100–240 V AC input
- Default pump roles pH, nutrient A, nutrient B (reassignable in the app)
- Mounting wall-mounted, fan-cooled
- Pump tube life over 750 hours running
- Pump motor life over 1,500 hours running
- In the box PeriPod L3, dosing cable, power supply, tubing, m...
- Dimensions 39.1 x 15.6 x 15.4 cm
Bluelab 2.77 EC Standard Solution Box of 6 – EC Calibration
- Brand Bluelab
- Conductivity 2.77 EC / 27.7 CF at 25 °C
- ppm equivalents 1385 ppm (500 scale) / 1940 ppm (700 scale)
- Use accuracy checks and calibration of EC, CF and ppm...
- For Bluelab Truncheon, Conductivity Pen, Combo Meter,...
- Recommended test interval every 30 days, after probe cleaning
Milwaukee Smart Combi Meter – pH & EC Meter Hydroponics
- pH meter range 0.0-14.0 pH
- EC meter range 0.0-10.0 mS/cm
Bluelab pH 4.0 Solution Sachets – For pH Meter Calibration
- Contents 30 sachets
- Volume per sachet 18ml
- Solution pH 4.0 calibration buffer
- Format single-use, tear-open pouch
- Use calibrating pH meters, pens, probes and controllers
- Brand Bluelab
Bluelab pH 7.0 Solution Sachets – For pH Meter Calibration
- Contents 30 sachets
- Volume per sachet 18ml
- Solution pH 7.0 calibration buffer
- Format single-use, tear-open pouch
- Use calibrating pH meters, pens, probes and controllers
- Brand Bluelab
Bluelab 2.77 EC Solution Sachets – For EC Meter Calibration
- Contents 30 sachets
- Volume per sachet 18ml
- Solution 2.77 mS/cm EC conductivity standard
- Format single-use, tear-open pouch
- Use calibrating EC, CF and PPM meters and probes
- Brand Bluelab
Bluelab pH Controller – Automatic Dosing for Reservoirs
- Control range 0.1-13.9 pH, resolution 0.1
- Dose rate 10ml per minute
- Reservoir capacity up to 760 litres
- Dimensions 20 x 11 x 21cm
- Power 100-240VAC, 50/60Hz, 0.4A output
- Operating environment 0-50C
- Includes pH probe, temperature probe, peristaltic pump, 4m...
- Languages English, Deutsch, Español, Français, Nederlands
Bluelab pH Controller Wi-Fi – Remote Dosing via Edenic App
- pH range 0.0-14.0, resolution 0.1, accuracy +/-0.1
- Pump flow rate up to 120ml/min, variable speed
- Connectivity optional Wi-Fi, Edenic app
- Power 100–240 V AC adaptor, 24 V DC 0.3 A output
- Operating environment 0-50C (32-122F)
- Includes pH probe, temperature probe, probe holder, 4m aci...
- Warranty 2-year controller, 6-month pH probe
- Control pH up or pH down, user selectable
- Control range 0.1–13.9 pH
- Calibration two or three point
- Temperature 0–50°C, accuracy ±1°C
- Probe cables 2 m
- Wi-Fi 2.4 GHz, 802.11 b/g/n
- Bluetooth Bluetooth 5 (Low Energy)
- Signal range 20 m indoor, 50 m line of sight
- Humidity 5–95% RH
- Protection not IP rated, indoor installation
- Dimensions 19.0 x 10.5 x 17.7 cm
Milwaukee pH51 Waterproof pH Meter – For Nutrient Solutions
- Type Handheld digital pH meter
- Range 0.0 to 14.0 pH
- Accuracy ±0.1 pH
- Calibration Manual, 1 or 2 point, via trimmers
- Protection Rating IP65 waterproof
- Battery 4 x button cell, included
- Battery Life Over 1500 hours of continuous use
- Electrode Replaceable double junction, MA73600
- Measures pH only
- pH range 0.0 to 14.0 pH
- pH accuracy ±0.1 pH at 25°C
- pH resolution 0.1 pH
- Calibration buffers pH 4.01, 7.01 and 10.01
- Waterproof rating IP65
- Display Large digital LCD
- Power 3 x 1.5 V alkaline, LR44 / A76, included
- Conditioning before first use Soak 2 hours in MA9015 storage solution
- Dimensions 165 x 30 x 30 mm
- Operating environment 0 to 50°C, up to 100 %RH
- Warranty 2 years, 6 months on the electrode
Bluelab Pro Controller Wi-Fi – pH & EC Automation
- Brand Bluelab
- Measures pH, conductivity and temperature
- Monitoring Continuous, 24/7
- Connectivity Built-in Wi-Fi, integrates with Edenic.io, can be...
- Probes Replaceable, high-precision
- Dosing Automated via Bluelab PeriPod M3, M4 or L3 (sold ...
- Temperature control Compatible with Bluelab PowerPod
- Safety Lockouts, visual alarms and automated dosing stops
- Settings Customisable pH, conductivity and dosing routines
- CF range 0 to 50 CF
- Conductivity control range 0.1 to 4.9 EC
- Conductivity range 0.0 to 5.0 EC
- pH control range 0.1 to 13.9 pH
- pH range 0.0 to 14.0 pH
- ppm 500 range 0 to 2,500 ppm 500 (TDS)
- ppm 700 range 0 to 3,500 ppm 700
- Signal range 20 m indoor, 50 m line of sight
- Temperature control range 1 to 49°C
- Temperature range 0 to 50°C (32 to 122°F)
- Conductivity accuracy ±0.1 EC at 25°C
- pH accuracy ±0.1 pH at 25°C
- pH resolution 0.1 pH
- Temperature accuracy ±1°C at 25°C
- Conductivity calibration Optional, factory calibrated
- pH calibration One, two or three point (7.0, 4.0, 10.0)
- Waterproof rating Not IP rated, splash proof
- Display Large green LED, adjustable brightness
- Power supply 100 to 240 VAC, 50/60 Hz adaptor
- Probe cable length 2 m (6 ft) on each probe
- Probes supplied pH, conductivity and temperature probes
- App Edenic, Android 8.0+ or iOS 12+
- Bluetooth Bluetooth 5 (Low Energy)
- Dosing off-time 0 to 59 min 50 s, in 10-second steps
- Dosing on-time 1 to 10 minutes, in 1-second steps
- Dosing outputs Up to 3 PeriPods (M3, M4 or L3) chained
- Operating humidity 5 to 95 %RH
- Plug types 4 interchangeable
- Warranty 2 years, 6 months on the pH probe
- Wi-Fi 2.4 GHz, 802.11 b/g/n
Essentials pH Meter – Hydroponic Nutrient Solution Tester
- Range 0.0 to 14.0 pH
- Resolution 0.1 pH
- Accuracy +/- 0.2 pH
- Battery 4 x 1.5 V button cell
- Battery Life Approximately 150 hours continuous
- Auto Shut-off Approximately 15 minutes
- Product Life At least 365 tests
- Operating Temperature 0 °C to 50 °C
- Memory 10 readings
- Dimensions 170 x 32 x 15 mm
- Weight Approximately 70 g
Bluelab PeriPod M3 – Automatic Nutrient Doser
- pH dosing pump 1x peristaltic, 120ml/min (4fl oz/min)
- Nutrient dosing pumps 2x peristaltic, 120ml/min (4fl oz/min)
- pH tubing 4 metres (13ft) acid/alkaline resistant food-grade
- Nutrient tubing 3x 4 metres (13ft) food-grade
- Mounting Rugged wall mount
- Nutrient types One-part or two-part (A&B)
- System compatibility Recirculating and drain-to-waste
- Controller compatibility Bluelab Pro Controller and Bluelab Dosetronic (co...
- Serviceability Replaceable peristaltic pumps and tubing, individ...
Probe care and calibration
Buffer solutions, storage fluid and cleaner. A probe reads wrong long before it reads nothing.
Single elements and trace
One element at a time, for correcting a shortage without lifting the whole feed.
The full range
pH up, pH down and calibration for grow tents
Nutrients only become available to the plant within a fairly narrow pH window, so a feed that's perfectly mixed but sitting outside range is close to wasted. Coco and hydro growers should be aiming for pH 5.8 to 6.2 at the root zone; soil is more forgiving at 6.0 to 6.5. Check pH after mixing nutrients, not before — adding concentrate always shifts the reading, sometimes by half a point or more.
Canna pH Down is a bloom-specific acid concentrate that plays nicely with Canna's own base feeds; most pH down products work fine across brands as long as you dose gradually. Meters drift over time, which is why Growth Technology Buffer 4 and Buffer 7 calibration solutions matter — recalibrate a digital pH pen roughly every two to four weeks, or immediately if readings start looking off compared to a fresh mix.
What's on the shelf
- Growth Technology — Buffer 4 and Buffer 7 calibration fluid, plus Liquid Silicon for buffering pH swings at the root.
- GHE — Flora Kleen, a reservoir and root-zone cleaner that also helps correct pH drift caused by salt build-up.
- Canna and Ecothrive — pH Down (bloom), Cal-Mag Agent for hard water, and Neutralise for stripping chlorine and chloramine from mains water before it hits the reservoir.
If you're topping up a hydro reservoir daily, water can drift half a point or more overnight as roots take up nutrient unevenly — check first thing each morning rather than trusting yesterday's reading. Pair a meter from meters with your calibration fluid, and see base feeds for the nutrients you're actually correcting pH for.
Express Delivery available, free over £99. Ring the shop on 020 3488 0419 for advice, six days a week.