Easy Log temperature data logger EL-USB-1 battery not included

Novus LogBox AA Micro Electronic Data Logger Analogue Signals 64K Memory IP65

Portable Digital DO Meter 0 to 20 mg/L for Environmental Water Testing

Dissolved Oxygen Meter Digital with LCD Display for Aquaculture Monitoring

HWM Smartlog water Industry Data Logger Transmitter

32-Segment LED Audio Level Indicator VU Meter for DIY Sound Monitoring

GN102 Digital Noise Meter for Home Noise Monitoring and Sound Level Control

GN102 Decibel Meter for Safe Sound Level Monitoring in Any Environment