AEDIKO 4pcs Relay Module DC 5V Relay Switch 1 Channel Relay Board with Optocoupler Isolation Support High or Low Level Trigger auspowers_batchone The smallest pH pen with

The smallest pH pen with reliable testing performance for regular liquid e

Insulation resistance: 20M ohms or more

surface galvanized

Some chemicals stay behind where your kids play

AEDIKO 4pcs Relay Module DC 5V Relay Switch 1 Channel Relay Board with Optocoupler Isolation Support High or Low Level Trigger auspowers_batchone The smallest pH pen withAEDIKO 4pcs Relay Module DC 5V Relay Switch 1 Channel Relay Board with Optocoupler Isolation Support High or Low Level Trigger 5V Relay Module Features: Trigger Current: 2 5mATrigger Voltage(LOW): 0 4VTrigger Voltage(HIGH): 4. 5 12VInsulation Resistance: 100M (500VDC)Power Indicator (Green), Relay Status Indicator (Red)User Friendly Interface Design. All Interfaces Can Be Connected Via Terminal Wiring Leads Directly Package Contents: 4x 1 Channel