PH850-SL Portable pH Meter for Soil (Direct Measurement), Equipped with LabSen® 553 Electrode


  • Equipped with Swiss LabSen® 553 POM 3-in-1 pH/Temperature Spear Electrode, designed for direct soil pH measurement. No more slurry making.
  • Intelligent Functions: Self-Diagnosis of out-of-range value and electrode invalidation, auto. calibration, electrode slope display, Auto. power-off, easy parameter setting
  • Rugged Structure Design: IP57 waterproof rating, soft silicone case gives you a firm and comfortable grip
  • Powered by AAA Alkaline batteries
  • The foldable stand also allows use as a benchtop meter

Apera Instruments PH850-SL Portable pH Meter is designed for professional direct soil pH measurements. The equipped Swiss LabSen 553 3-in-1 pH/Temp. Electrode adopts Polymer electrolyte, Long-Life reference system, and a unique blue spear sensor tip, making precise direct soil pH measurement easier than ever.

This soil pH meter has a ±0.01 pH accuracy in a range of 0-14 pH, and Temperature Range: -5 to 80°C (23 to 176°F), Auto Calibration with auto-recognition of up to 12 kinds of buffer solutions, Auto. Temp. Compensation, and supports stable reading/auto-hold display mode. The meter’s digital filter technology improves response time and accuracy.

Intelligent Functions: Smart Self Diagnosis reminds of out-of-range measurement, incorrect calibration, and electrode invalidation. Other functions include auto. calibration, auto. lock, easy parameter setting, pH electrode’s slope display, auto. power off, etc.

Reliable Structure Design: foldable stand allows use as a benchtop meter; soft silicone case gives you a nice firm grip; connector protection cap, IP57 waterproof rating; Powered by 3 AA batteries. The meter is RoHS and CE certified and comes with a 3-year warranty (6 months for the electrode).


How to direct-test soil pH?

  1. If the soil is dry, add a small amount of distilled or RO water to moisten the soil (do NOT add tap water since it will affect the pH value significantly). Ideally, wait 24 hours before you take a measurement. 
  2. Insert the pH connector (the blue one) to the pH socket, and twist it clockwise to lock in; Insert the temperature connector to the temperature socket. 
  3. Rinse the probe with distilled water/RO water before inserting it into the soil. 
  4. If measuring outside of solution, rockwool or small pots, remove the top 5cm/2inch soil from the surface of the sample area. Insert the probe approximately 4 to 6 inches (10 to 15cm) into the soil samples from various locations (3 to 4), wait for the stable readings before recording (smiley face icon stays on the screen). 
  5. Users can take the average of the measured data as the representative pH level of the sample area. 
  6. Do NOT use extra force to insert the probe. If you feel like the probe can’t be inserted any deeper, stop inserting. The spear tip could break with excessive external force. 
  7. Rinse off the soil residue thoroughly between tests with distilled water. Use the probe cleaning brush if needed.


Technical Specs
pH Range 0 to 14 pH
Resolution 0.01/0.1 pH
Accuracy ±0.01 pH ±1 digit
Temperature Compensation 0 to 100°C (Auto or Manual)
mV Range -1000 mV – 0 – 1000 mV
Resolution 1 mV
Accuracy ±0.2% F.S ±1 digit
Temp. Range 0 to 100°C (23 to 212°F)
Resolution 0.1°C
Accuracy ±0.5°C ±1 digit
Other Specs
Data Storage N/A
Storage Content N/A
Output N/A
Power AA Batteries * 3 / DC5V (USB port)
IP Ranking IP57 dust-proof and waterproof
Dimensions& Weight Meter: (88_170_33 ) mm/ 313g With case_(360_270_76) mm/ 1.6kg
pH Electrode (LabSen 553) Specs
Housing Material PVC
Temperature sensor Yes
Junction Ceramic+Single-pore
Reference Electrode Long-life
Electrolyte Polymer
Shape of glass membrane Spear
Range 0 to 14 pH
Temperature Range 0 to 80°C (32 to 176°F)
Connector BNC and RCA


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