The waterproof Oakton Multiparameter PCS Testr 35 is a pocket-sized meter used for pH, TDS and temperature readings. 

Also known as the Oakton MULTI PT Testr 35, it features auto-shutoff, user-adjustable temperature coefficient, self-adjusting TDS, and low-battery indicator.

The portable Multiparameter PCS Testr 35 is a good fit for nutrient solution testing with hydroponic growers.

Specifications:

pH Range: 0.0 to 14.0
pH Accuracy: ±0.01 pH
Conductivity Range: 0 to 200 uS; 201 to 2000 uS; 2.01 to 20.00 mS
TDS Range: 0 to 100.0 ppm; 100 to 1000 ppm;01.00 to 10.00 ppt
TDS Accuracy: TDS: ±1% full-scale
Operating Temperature: 32 to 122°F (0 to 50°C)
Temperature Accuracy: Temperature: ±0.5°C, ±0.9°F
Power Source: Four 1.5 V alkaline batteries (included)
Battery Life: Apprx. 250 hours continuous use

This multi tester features single-junction pH electrodes for longer life and wider range of sample compatibility. Pin-style conductivity sensors feature stainless steel electrodes for chemical resistance and durability. Replaceable sensor module saves you money by reusing the meter body.

Dimensions: 6.5" Long x 1.5" Diameter
Weight: 3.25 oz