Waterproof pHTestr® 30+ (Oakton)

Waterproof pHTestr 30+ is great for outdoor applications such as taking pH measurements in lakes and streams. Designed to float in water, you can even attach a line to the housing for easy retrieval. Valox sensor housing resists most chemicals.

The pHTestr 30 has a replaceable sensor for easy maintenance. Double-junction electrode sensor handles wastewater and solutions containing sulfides, heavy metals, and TRIS. Electrode sensor offers a clog-resistant Kynar® junction and a recessed, glass pH bulb to protect against breakage.

The keypad clicks to confirm operation, and allows access to a variety of functions. Calibrate up to three pH points with the auto-buffer recognition at both USA and NIST standard buffers. Additional features include a automatic temperature compensation (ATC), hold function, auto-off function, self-diagnostic error messages, and a three-segment battery-life indicator.

Meter includes: protective plastic storage case, lanyard, and batteries.


Meter Type Tester
Display type LCD
Min pH (pH) -2
Max pH (pH) 16
pH Resolution 0.01
pH Accuracy ±0.01
Buffer Recognition NIST and USA
Calibration Up to 3 points
Min Temperature (° C) 0
Max Temperature (° C) 50
Min Temperature (° F) 32
Max Temperature (° F) 122
Temperature Resolution 0.1
Temperature Accuracy 0.9 F, 0.5 C
Temperature compensation Automatic
Waterproof Yes
Battery 4 x AAA batteries (included)
Battery life (hr) 500
Diameter (cm) 3.81
Diameter (in) 1 1/2
Description/Item No. Details Mfr. Item No. Your Cost/Qty Purchase
Waterproof pHTestr® 30+ Pocket Tester
pHTestr 30+, 0.01 pH resolution with temperature display 35634-30
Add to Cart 11 In Stock 11 In Stock
Replacement Electrode
pHTestr 30+ Replacement Electrode 35634-03
Add to Cart This item is on back-order. Allow 5-10 business days. Please call us at 800-328-8378 with any questions about availability. In Stock