Apera Instruments AI311 Premium Series PH60 Waterproof pH Pocket Tester Kit, Replaceable Probe, ±0.01 pH Accuracy, Lcd display Stun Guns Press twice and hold on

Press twice and hold on the second press to cycle through colors

Also to inspect circuit tester integrity of headlights

Part Number: Double Lock-02

hidden recording pen

EFFORTLESS-TO-USE: Shake

Apera Instruments AI311 Premium Series PH60 Waterproof pH Pocket Tester Kit, Replaceable Probe, ±0.01 pH Accuracy, Lcd display Stun Guns Press twice and hold onBrand: Apera Instruments Features: NOTE: A few drops of water are added to the electrode cap before the product leaves the factory. This is to maintain the sensitivity of the electrode. Therefore, when you use it for the first time, it is normal to find water droplets in the electrode cap Accuracy: 0. 01 pH; range: 2. 00 to 16. 00 pH, 32 to 122F (0 to 50C); Auto. Power Off: 8 minutes without operation Easy 1 3 points auto. calibration, recognizes 5