Bluelab pH 4.0 Calibration Solution (250ml)
Bluelab pH 4.0 Calibration Solution (250ml)
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The Bluelab pH 4.0 Calibration Solution (250ml) is the second step in a 2-point calibration, to fine-tune your Bluelab pH pen or probe for reliable, accurate readings. Used after Bluelab pH 7.0 Calibration Solution, it's the ideal choice for growers who regularly calibrate their testing equipment and want dependable results every time. Accurate pH readings start with proper calibration.
Why Growers Love It
- Essential for calibrating Bluelab pH pens, probes and meters.
- Used as the second step (2-point calibration) after Bluelab pH 7.0 Calibration Solution.
- 250ml bottle provides plenty of solution for routine calibration.
- NIST certified and manufactured to strict laboratory standards.
- Helps maintain fast, accurate readings while extending the life of your pH equipment.
- Ideal for regular growers who calibrate their testing equipment frequently.
Grow Tip
For the most accurate results, calibrate your pH pen or probe at least once a month, or more often if it's used regularly. To avoid contaminating the bottle, pour a small amount into a clean container and discard it after use—never pour used solution back into the bottle.
Pairs Perfectly With
Use alongside the Bluelab pH 7.0 Calibration Solution for a complete 2-point calibration. After calibrating, store your probe in Bluelab pH Probe KCl Storage Solution to keep it hydrated and ready for your next grow.
Because healthy plants start with accurate readings.
Additional Details
Shipping & Delivery
In Stock Quantities Online may vary due to in store sales. Online quantities are pulled from all of our branches stock levels.
- We will do our best to fulfil your order. If your order cannot be filled promptly you will be refunded via method of purchase or contacted to arrange alternate options.
We will only deliver to a New Zealand address at this point in time. We don’t deliver to PO Boxes.
Pickup orders may show available in store on the product page but may not be available in the quantities in your cart. You may have to adjust the quantities in your cart at checkout to be able to pick up at a specific store.
- Pickup Orders are confirmed once checked by staff at location of pickup. Please wait to be contacted by staff before coming to store.
Photo ID Of Person Who's Name is On The Order Must Be Presented to staff when picking up and must match name on order. We do not accept name changes of orders once placed so please make sure you are filling in the correct details.
If goods are Not Received within 7 days of purchase, contact us.
Any Damaged or Missing Items from your order must be brought to our attention within 7 days of receiving your order.
If your item is Oversized or More Than 25kg you may be contacted for an additional freight charge to be calculated upon picking of order.
We use Courier Post as our freight provider. Prices and providers are subject to change without prior notice.
To ensure successful delivery make sure there is some one Present at the Delivery Address during business hours.
Delivery times are normally 1-2 days to the North Island and 2-5 days to the South island once dispatched. Rural delivery can take an extra day longer.
In Stock Quantities Online my vary due to in store sales. We will do our best to fulfil your order promptly. If your order cannot be filled promptly you will be refunded or contacted to arrange alternate options.