SMART SENSOR Handheld Carbon Monoxide Meter with High Precision CO Gas Tester Monitor Detector Gauge LCD Display Sound and Light Alarm 0-1000ppm - Walmart.com
Digital Rpm Tachometer Sensor Meter - 4bit Digital Led Meter Sensor High-precision - Aliexpress
Amazon.com: Indoor/Outdoor Moisture Sensor Meter with Full Color Instruction Card, Soil Water Monitor, Plant Care, Garden,Lawn : Patio, Lawn & Garden
Liquid Flow Meter - Brass 1/2 Nominal Threaded : ID 833 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Fluke 805ES External Vibration Sensor for 805 Vibration Meter
Gravity: Analog pH Sensor / Meter Pro Kit For Arduino — Arduino Online Shop
MINI 4 IFR | Infrared temperature meter with sensor - KOSO North America
SPEED SENSOR For HONDA CBR900RR CBR929RR CB600F Hornet Speedo Meter Sensor | eBay
Aroya SOLUS EC Meter. 3 in 1 Soil Moisture, EC and Temp Sensor For Grow Mediums