Palintest Phenol Red Test Tablets – 250 Pack (AK131) for pH Testing (Comparator Use Only)

Palintest AK131 Phenol Red tablets are designed for pH measurement in pool and spa water using colorimetric comparator kits only. They are not compatible with photometers. For photometer-based pH testing, use Palintest Phenol Red (AP130) instead. Each pack contains 250 individually foil-sealed tablets.

Important: Comparator Use Only

AK131 is formulated for colorimetric (visual comparator) pH testing. If you use a Palintest photometer such as the Pooltest 6 or Pooltest Expert, you need AP130, not AK131.

Key Features

• Tests: pH level in pool and spa water
• Method: Colorimetric comparator (visual colour matching) — not suitable for photometers
• 250 individually foil-sealed tablets per pack — extended shelf life
• Provides clear colour development for easy pH reading
• Part number / Palintest code: AK131

Related Palintest Test Tablets

pH Testing

• Palintest Phenol Red (AP130) – pH, Photometer, 250 Pack — photometer version
• Palintest Phenol Red (AK131) – pH, Comparator Use Only, 250 Pack — this product

Chlorine Testing

• Palintest DPD 1 (AP011) – Free Chlorine, Photometer, 250 Pack
• Palintest DPD 1 Rapid (AT010) – Free Chlorine, Comparator/Rapid, 250 Pack — obsolete, limited stock
• Palintest DPD 3 (AP031) – Total Chlorine, Photometer, 250 Pack
• Palintest DPD XF (AP013) – Extended Free Chlorine, Photometer, 250 Pack
• Palintest DPD XT (AP033/1) – Chlorine, Photometer, 250 Pack
• Palintest DPD Oxystop (AP017) – Removes MPS Interference, 250 Pack

Alkalinity Testing

• Palintest Alkaphot (AP188) – Total Alkalinity, Photometer, 250 Pack
• Palintest Alkavis (250F) – Total Alkalinity, Rapid, 250 Pack

Hardness Testing

• Palintest Calcicol (AP252) – Calcium Hardness, 250 Pack
• Palintest Hardicol (AP254) – Total Hardness, Photometer, 250 Pack

Other Parameters

• Palintest Bromine (AP060) – Bromine, Photometer, 250 Pack
• Palintest Cyanuric Acid (AP087) – Stabiliser Level, Photometer, 250 Pack
• Palintest Copper (AP187) – Copper, Photometer, 250 Pack
• Palintest Chloride (AP268) – Chloride, Photometer, 250 Pack

Specifications

• Part Number: AK131
• SKU: AK131
• Parameter: pH (Phenol Red — Comparator Use Only)
• Pack Size: 250 tablets
• Format: Individually foil-sealed tablets
• Brand: Palintest
• Condition: New

Frequently Asked Questions

What is the difference between AK131 and AP130 Phenol Red tablets?

AK131 is formulated for colorimetric comparator kits (visual colour matching) and is not compatible with photometers. AP130 is the photometer-compatible version for use with Palintest Pooltest photometers. If you use a Palintest photometer, order AP130, not AK131.