G1" Water Flow Sensor, Male Thread Brass Hall Effect Sensor Flow Meter 2~50L/MIN, DC 24V Powered Flowmeter Counter for Arduino, for Raspberry Pi for Reverse Osmosis: Amazon.com: Industrial & Scientific
HomeLab pH-meter from HomeLab.link on Tindie
CINTAS PI METER
Freemans Pi Tape, For Measurement, 30 Meter
Cable Extension Kit for RPi Camera Modules V1/V2/HQ, and 16MP/64MP/ToF Camera Module - Arducam
SparkFun Distance Sensor - 1.3 Meter, VL53L4CD (Qwiic) | The Pi Hut
Vintage Lehmann & Michels Germany Pi-meter Mean Pressure - Etsy
TDS Meter Sensor
Westinghouse Electric PI-161 Portable Phase Angle Meter | Control System Labs
WESTINGHOUSE PI-161 PORTABLE PHASE ANGLE METER TEST EQUIPMENT
Phase Rotation Meter PCE-PI 10 | PCE Instruments
Vintage Lehmann & Michels Germany Pi-meter Mean Pressure - Etsy
Flex Cable for Raspberry Pi Camera - 2 meters
Portable flow meter with integrated data logger - PI 500