Neptune 7.00 pH Calibration Fluid

Keep your pH probe calibrated!

Neptune Systems single-use pH calibration packets make calibrating your pH probe simple and fast. Just tear open the top, and a stick your probe into the solution when performing the calibration procedure.

Over the course of a couple months, it is common for pH probes to not read exactly correct and that can be fixed by calibrating your probe. Almost all monitoring devices will allow you to calibrate your pH probe, and a majority of them will let you calibrate your probe to a high and a low point. For saltwater aquariums, it is best to use a calibration solution with a pH of 7.0 for the low point and 10.0 pH for the high.

We recommend calibrating standard pH probes every 3 months or as needed, where double junction pH probes can go up to 6 months before calibration is required.

What’s Included?

1x 7.00 pH Single Use Calibration Packet.

Backorder & Dispatch Timeline

This item is stocked to order. Back-orders are consolidated and placed with our overseas suppliers once a month, on the last day of the month, and all such orders are shipped before the 15th of the following month.

Back-orders cannot be cancelled once they have been placed with the supplier. If you cancel before that, payment-gateway charges of 2% plus GST are deducted and the balance refunded. In the rare case a supplier cannot fulfil the item, we will offer you an alternative first, and refund in full with no deduction if you would rather not take it.

Setup & Use

Use this pH 7.00 buffer to calibrate a pH probe on an Apex. For saltwater tanks, calibrate with the 7 and 10 standards together. The maker also lists a pH 4 standard for freshwater or calcium reactor use. Each packet is single use. Tear open the top and put the probe in the solution.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number, or email us if you would rather, and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 48 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.